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Chemical Coordination and Integration: NEET MCQ Questions [100+ Solved]

Below are the NEET MCQ questions on Class 11/12 Biology Chapter “Chemical Coordination and Integration” based on the NCERT textbook. Solve the below free NEET mock test for a better understanding of the various topics. 100+ important MCQs (multiple choice questions) are given in this NEET question bank.

“Chemical Coordination and Integration” is the 22nd chapter in the unit “Human Physiology” of class XI or class 11th Biology NCERT. Do note that NEET (which is conducted by NTA) is based on NCERT textbooks so they are a must-have. You can also download PDFs of NCERT textbooks.

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Important Questions For NEET:

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  1. What is/are the correct statement(s) about hormones?
    (1) Hormones are non-nutrient chemicals.
    (2) Hormones act as intercellular messengers.
    (3) Hormones are produced in trace amounts.
    (4) Hormones may be proteins, steroids, glycoproteins and biogenic amines.
    (a) All of these
    (b) (1), (2) and (3)
    (c) Only (4)
    (d) (1) and (3)

(a) All of these

  1. What does the anterior lobe of the pituitary gland secrete?
    (1) FSH, GH and LH
    (2) GH, TSH and prolactin
    (3) TSH, ADH & prolactin
    (4) ACTH, TSH and oxytocin
    (a) (1) and (2)
    (b) (2) and (4)
    (c) (1) and (3)
    (d) (1), (2) and (3)

(a) (1) and (2)

  1. Which of the following statement(s) is/are true?
    (1) Maximum iodine is stored in the thyroid gland
    (2) Calcitonin is a non-iodinised hormone secreted by parafollicular cells of the thyroid gland.
    (3) Calcitonin (TCT) regulates the blood Ca+2 level
    (4) TCT is a hypocalcemic factor
    (a) All are correct
    (b) All are wrong
    (c) (1), (2) and (3) are correct
    (d) Only (4) are correct

(a) All are correct

  1. The anterior pituitary does not secrete which of the following hormones?
    (a) Growth hormone
    (b) Follicle stimulating hormone
    (c) Oxytocin
    (d) Adrenocorticotrophic hormone

(c) Oxytocin

  1. Mary is about to face an interview. She experiences sweating, increased heart rate, and breathing during the first five minutes before the interview. Her restlessness is caused by which hormone?
    (a) Estrogen and progesterone
    (b) Oxytocin and vasopressin
    (c) Adrenaline and noradrenaline
    (d) Insulin and glucagon

(c) Adrenaline and noradrenaline

  1. In our bodies, what steroid regulates water and electrolytes?
    (a) insulin
    (b) melatonin
    (c) testosterone
    (d) aldosterone

(d) aldosterone

  1. What is the role of thymosin?
    (a) raising the blood sugar level
    (b) raising the blood calcium level
    (c) differentiation of T-lymphocytes
    (d) decrease in blood RBCs

(c) differentiation of T-lymphocytes

  1. Which statement is true?
    (a) Endocrine glands regulate neural activity, and the nervous system regulates endocrine glands
    (b) Neither hormones control neural activity nor the neurons control endocrine activity
    (c) Endocrine glands regulate neural activity, but not vice-versa
    (d) Neurons regulate endocrine activity, but not vice versa

(a) Endocrine glands regulate neural activity, and the nervous system regulates endocrine glands

  1. After ovulation, which part of the ovary acts as an endocrine gland in mammals?
    (a) Stroma
    (b) Germinal epithelium
    (c) Vitelline membrane
    (d) Graafian follicle

(d) Graafian follicle

  1. The resident of a multistory building on the seventh floor starts descending the stairs quickly after feeling the tremors of an earthquake. This action was initiated by which hormone?
    (a) Adrenaline
    (b) Glucagon
    (b) Gastrin
    (d) Thyroxine

(a) Adrenaline

  1. What pair of organs consists only of endocrine glands?
    (a) Parathyroid and Adrenal
    (b) Pancreas and Parathyroid
    (c) Thymus and Testes
    (d) Adrenal and Ovary

(a) Parathyroid and Adrenal

  1. What is a health disorder caused by thyroxine deficiency in adults and characterised by
    (i) a low metabolic rate,
    (ii) increase in body weight and
    (iii) tendency to retain water in tissues
    (a) simple goitre
    (b) myxoedema
    (c) cretinism
    (d) hypothyroidism

(b) myxoedema

  1. Which of the following is not likely to be affected by injury to the adrenal cortex?
    (a) Aldosterone
    (b) Both Androstenedione and Dehydroep-iandrosterone
    (c) Adrenaline
    (d) Cortisol

(c) Adrenaline

  1. Which pair is incorrectly matched?
    (a) Glucagon – Beta cells (source)
    (b) Somatostatin – Delta cells (source)
    (c) Corpus luteum – Relaxin (secretion)
    (d) Insulin – Diabetes mellitus (disease)

(a) Glucagon – Beta cells (source)

  1. The presence of toxic agents in food, which interfere with the synthesis of thyroxine, results in the development of what?
    (a) toxic goitre
    (b) cretinism
    (c) simple goitre
    (d) thyrotoxicosis

(c) simple goitre

  1. Increased are of glycogenesis, blood pressure and heartbeat are all connected with which hormone?
    (a) Insulin
    (b) Glucagon
    (c) Adrenaline
    (d) FSH

(c) Adrenaline

  1. If ovaries are removed from a pregnant woman in the 4th month of her pregnancy, what would happen?
    (a) Development of embryo becomes abnormal
    (b) Abortion occurs after some time
    (c) Embryo develops normally till birth
    (d) None of these

(c) Embryo develops normally till birth

  1. During pregnancy, corpus luteum persists because of a hormone called?
    (a) Chorionic gonadotropic hormone
    (b) FSH
    (c) Estrogen
    (d) Progesterone

(a) Chorionic gonadotropic hormone

  1. Which one of the following is a temporary endocrine gland?
    (a) Pineal
    (b) Pancreas
    (c) Placenta
    (d) Parathyroid

(c) Placenta

  1. A human female begins to develop male characteristics like beards, enlarged clitoris, degeneration of uterus and ovaries etc. This may be due to
    (a) Overproduction of oestrogen and testosterone
    (b) Damage to the posterior pituitary
    (c) Overproduction of adrenal androgens
    (d) Surgical removal of mammary gland

(c) Overproduction of adrenal androgens

  1. What is the function of renin?
    (a) to reduce blood pressure
    (b) vasodilation
    (c) degradation of angiotensinogen to angiotensin-II
    (d) stimulation of copious urination

(c) degradation of angiotensinogen to angiotensin-II

  1. What organs function as modulators and effectors respectively in the homeostatic regulation of blood sugar levels?
    (a) Liver and islets of langerhans
    (b) Hypothalamus and liver
    (c) Hypothalamus and islets of langerhans
    (d) Islets of langerhans and hypothalamus

(c) Hypothalamus and islets of langerhans

  1. What endocrine gland functions as a biological clock and a neurosecretory transducer?
    (a) Adrenal gland
    (b) Thyroid gland
    (c) Pineal gland
    (d) Thymus gland

(c) Pineal gland

  1. Before releasing its secretion into the bloodstream, which of the following endocrine glands stores its secretion in the extracellular space?
    (a) Pancreas
    (b) Adrenal
    (c) Testis
    (d) Thyroid

(d) Thyroid

  1. The hormone that regulates calcium and phosphorus metabolism is secreted from?
    (a) Thyroid
    (b) Parathyroid and thyroid both
    (c) Thymus
    (d) Pancreas

(b) Parathyroid and thyroid both

  1. Which hormone acts on the exocrine part of pancreas?
    (a) GIP
    (b) Insulin
    (c) Secretin
    (d) Steapsin

(c) Secretin

  1. Oral contraceptives contain progesterone, which prevents pregnancy by?
    (a) preventing the cleavage of the fertilized egg
    (b) preventing the formation of ova
    (c) blocking ovulation
    (d) creating an unfavourable chemical environment for the sperms to survive in the female reproductive tract

(c) blocking ovulation

  1. Cows are injected with what to produce more milk?
    (a) sorbitol
    (b) prolactin
    (c) gonadotrophs
    (d) stilbesterol

(b) prolactin

  1. Cell division, protein synthesis, and bone growth are all promoted by which hormone?
    (a) GH (STH)
    (b) PTH
    (c) LH
    (d) ACTH

(a) GH (STH)

  1. Which endocrine gland functions under the nervous system?
    (a) Cortex of adrenal glands
    (b) Medulla of adrenal glands
    (c) Anterior pituitary glands
    (d) Posterior pituitary gland

(b) Medulla of adrenal glands

  1. Despite not being a peptide or protein in nature, which hormone is related to mineral metabolism?
    (a) PTH
    (b) ANF
    (c) Aldosterone
    (d) All of these

(c) Aldosterone

  1. Regarding the regulation of its secretory function, which of the following is not directly controlled by the pituitary gland?
    (a) Adrenal cortex
    (b) Adrenal medulla
    (c) Thyroid
    (d) Testis

(b) Adrenal medulla

  1. The activity of what is stimulated by secretin?
    (a) Liver
    (b) Gastric gland
    (c) Pancreas
    (d) Gall-bladder

(c) Pancreas

  1. What are cholecystokinin and secretin?
    (a) Hormones liberated by the mucosa of the duodenum and stimulate the gall bladder and pancreas respectively
    (b) Hormones stimulating the liver
    (c) Hormones stimulating the pancreas
    (d) Enzymes

(a) Hormones liberated by the mucosa of the duodenum and stimulate the gall bladder and pancreas respectively

  1. Oversecretion of what causes Conn’s disease?
    (a) ADH
    (b) ACTH
    (c) Oxytocin
    (d) Aldosterone

(d) Aldosterone

  1. Hypersecretion of what causes acromegaly?
    (a) Insulin
    (b) Thyroxine
    (c) Growth hormone
    (d) None of these

(c) Growth hormone

  1. The structure of steroid hormones is similar to the structure of what?
    (a) Tyrosine
    (b) Cholesterol
    (c) Coenzyme A
    (d) Glycerol

(b) Cholesterol

  1. A person passes much urine and drinks much water put his blood glucose level normal. What could cause this condition?
    (a) a reduction in insulin secretion from the pancreas
    (b) a reduction in vasopressin secretion from the posterior pituitary
    (c) a fall in the glucose concentration in urine
    (d) an increase in the secretion of glucagon

(b) a reduction in vasopressin secretion from the posterior pituitary

  1. Somatostatin is derived from the same source as?
    (a) Thyroxine and calcitonin
    (b) Insulin and glucagon
    (c) Somatotropin and prolactin
    (d) Vasopressin and oxytocin

(b) Insulin and glucagon

  1. What is the source of melanocyte stimulating hormone (MSH)?
    (a) parathyroid
    (b) pars intermedia of pituitary
    (c) anterior pituitary
    (d) posterior pituitary

(b) pars intermedia of pituitary

  1. What produces melatonin?
    (a) thymus
    (b) skin
    (c) pituitary
    (d) pineal gland

(d) pineal gland

  1. The hormone that promotes pregnancy and stimulates mammary glands for the formation of alveoli for milk storage secreted from?
    (a) Ant. Pituitary
    (b) Post. Pituitary
    (c) Graafian follicle
    (d) Corpus luteum

(d) Corpus luteum

  1. What do mammals born without a thymus gland fail to manufacture?
    (a) B – Lymphocytes
    (b) T – Lymphocytes
    (c) Plasma cells
    (d) Basophils

(b) T – Lymphocytes

  1. The endocrine gland that is responsible for immunity in man is?
    (a) Parathyroid gland
    (b) Adrenal gland
    (c) Thymus gland
    (d) Posterior pituitary gland

(c) Thymus gland

  1. A gland which gradually atrophies at the age of 14- 16 due to the activities of sex glands is?
    (a) thyroid
    (b) parathyroid
    (c) pancreas
    (d) thymus

(d) thymus

  1. Adrenaline directly affects?
    (a) S. A. node
    (b) Beta-cells of Langerhans
    (c) the dorsal root of the spinal cord
    (d) epithelial cells of the stomach

(a) S. A. node

  1. The immune system is suppressed by which hormone?
    (a) Glucagon
    (b) Thymosin
    (c) Adrenaline
    (d) Cortisol

(d) Cortisol

  1. One of the second messengers involved in the mechanism of action of a protein hormone is?
    (a) Cyclic AMP
    (b) Insulin
    (c) T3
    (d) Gastrin

(a) Cyclic AMP

  1. Which of the following is a steroid hormone that regulates glucose metabolism?
    (a) corticosterone
    (b) 11- deoxycorticosterone
    (c) cortisone
    (d) cortisol

(d) cortisol

  1. Among the following, which is not a second messenger in hormone action?
    (a) Calcium
    (b) Sodium
    (c) cAMP
    (d) cGMP

(b) Sodium

  1. Among the following, which does not serve as a neurotransmitter?
    (a) Epinephrine
    (b) Norepinephrine
    (c) Cortisone
    (d) Acetylcholine

(c) Cortisone

  1. Neurohormones are accumulated and released from which of the following centres?
    (a) Intermediate lobe of the pituitary
    (b) Hypothalamus
    (c) Anterior pituitary lobe
    (d) Posterior pituitary lobe

(d) Posterior pituitary lobe

  1. Glucogenesis, blood vessel dilation and increased oxygen consumption are all caused by which hormone?
    (a) Insulin
    (b) Adrenaline
    (c) Glucagon
    (d) ACTH

(b) Adrenaline

  1. Epinephrine hormone is
    (a) Secreted from the pancreas and decreases heartbeat
    (b) Secreted from the adrenal medulla and increases heartbeat
    (c) Secreted from the adrenal medulla and decreases heartbeat
    (d) Secreted from the pancreas and increases heartbeat

(b) Secreted from the adrenal medulla and increases heartbeat

  1. Which hormone affects sodium retention in the body?
    (a) Adrenal cortex
    (b) Adrenal medulla
    (c) Parathyroid
    (d) Thyroid

(a) Adrenal cortex

  1. In response to stress, adrenaline and cortisol are secreted. For both of these hormones, which statement is true?
    (a) They act to increase blood glucose
    (b) They are secreted by the adrenal cortex
    (c) Their secretion is stimulated by adrenocorticotropin
    (d) They are secreted into the blood within seconds of the onset of stress.

(a) Adrenal cortex

(a) They act to increase blood glucose

  1. What does thymosin stimulate?
    (a) Milk secretion
    (b) Erythrocytes
    (c) T-lymphocytes
    (d) Melanocytes

(c) T-lymphocytes

  1. What disease is caused by an under secretion of cortisol?
    (a) Anaemia
    (b) Addison’s disease
    (c) Hyperglycemia
    (d) Mental illness or retardation

(b) Addison’s disease

  1. Hormones of steroids
    (a) have only cell surface receptors
    (b) are lipophobic
    (c) act through altering the activity of proteins in the target cell
    (d) are produced only by adrenal cortex.

(c) act through altering the activity of proteins in the target cell

  1. A man’s urine is very dilute and his urine volume is too high, so he is dehydrated and thirsty. What is the cause of this?
    (a) Hypersecretion of ADH
    (b) Hyposecretion of ADH
    (c) Both (a) and (b)
    (d) None of these

(b) Hyposecretion of ADH

  1. Which hormone regulates the 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle?
    (a) calcitonin
    (b) prolactin
    (c) adrenaline
    (d) melatonin

(d) melatonin

  1. Which of the following pairs of hormones can easily pass through the target cell’s cell membrane and bind to a receptor inside it(Mostly in the nucleus)?
    (a) Insulin, glucagon
    (b) Thyroxin, insulin
    (c) Somatostatin, oxytocin
    (d) Cortisol, testosterone

(b) Thyroxin, insulin

  1. What does parathormone induce?
    (a) Increase in serum calcium level
    (b) Decrease in serum potassium level
    (c) Increase in blood sugar level
    (d) Decrease in blood sugar level

(a) Increase in serum calcium level

  1. Steroid hormones like estrogen and testosterone are most likely bound to?
    (a) Membrane ions channels
    (b) Enzyme-linked membrane receptors
    (c) G-protein-linked membrane receptors
    (d) Cytoplasmic receptors

(d) Cytoplasmic receptors

  1. Glycosuria is a condition in which a man
    (a) Eats more sugar
    (b) Excretes sugar in the urine
    (c) Sugar is excreted in faeces
    (d) Has low sugar level in blood

(b) Excretes sugar in the urine

  1. A man is admitted to a hospital. An abnormally low body temperature, loss of appetite, and extreme thirst are affecting him. His brain scan would likely reveal a tumor in?
    (a) Medulla oblongata
    (b) Pons
    (c) Cerebellum
    (d) Hypothalamus

(d) Hypothalamus

  1. There are two hormones: oxytocin and vasopressin in the posterior pituitary, but they are better known as?
    (a) Antidiuretic hormone
    (b) Growth hormone
    (c) Corticotrophic hormone
    (d) Neurohypophyseal

(a) Antidiuretic hormone

  1. Which hormone has no role in menstruation?
    (a) LH
    (b) FSH
    (c) GH
    (d) TSH

(c) GH

  1. What causes tetany?
    (a) Hyperparathyroidism
    (b) Hypoparathyroidism
    (c) Hyperthyroidism
    (d) Hypothyroidism

(b) Hypoparathyroidism

  1. What secretes thymosin hormone?
    (a) Thyroid gland
    (b) Parathyroid gland
    (c) Thymus gland
    (d) Hypothalamus

(c) Thymus gland

  1. What does corpus luteum release?
    (a) Estrogen
    (b) Progesterone
    (c) Estrogen and progesterone
    (d) Androgen

(c) Estrogen and progesterone

  1. The group of hormones produced by Leydig cells are called?
    (a) androgens
    (b) estrogens
    (c) aldosterone
    (d) gonadotropins

(a) androgens

  1. What is the blood progesterone level during menstruation?
    (a) Low
    (b) Normal
    (c) High
    (d) Very high

(a) Low

  1. What is both a hormone and an enzyme?
    (a) ADH hormone
    (b) Acetylcholinesterase
    (c) Angiotensinogen
    (d) Renin

(d) Renin

  1. The hormones that initiate milk ejection, stimulate milk production, and promote ovarian follicle growth are respectively known as?
    (a) PRL, OT and LH
    (b) OT, PRL and FSH
    (c) LH, PRL and FSH
    (d) PRH, OT and LH

(b) OT, PRL and FSH

  1. In adults, what will hypothyroidism and hyperparathyroidism respectively lead to?
    (a) Myxoderma and Cretinism
    (b) Grave’s disease and Hashimoto’s disease
    (c) Myxoedema and Osteitis fibrosa cystica
    (d) Addison’s disease and Cretinism

(c) Myxoedema and Osteitis fibrosa cystica

  1. In which of the following pairs is a hormone matched with a disease caused by its deficiency?
    (a) Insulin – Diabetes insipidus
    (b) Relaxin – Gigantism
    (c) Prolactin – Cretinism
    (d) Parathyroid hormone – Tetany

(d) Parathyroid hormone – Tetany

  1. Insulin acts in which of the following ways?
    (a) Increases blood glucose levels by hydrolysis of glycogen
    (b) Increases blood glucose levels by stimulating glucagon production
    (c) Decreases blood glucose levels of forming glycogen
    (d) Increases blood glucose level by promoting cellular uptake of glucose

(c) Decreases blood glucose levels of forming glycogen

  1. Norepinephrine
    (1) Is released by sympathetic fibres
    (2) Is released by parasympathetic fibres
    (3) Increases the heart rate
    (4) Decreases blood pressure
    Which of the above said statements are correct?
    (a) (1) and (4)
    (b) (1) and (3)
    (c) (2) and (3)
    (d) (2) and (4)

(b) (1) and (3)

  1. When treated with alloxan, what is destroyed?
    (a) stilt cells
    (b) beta-cells of Langerhans
    (c) sertoli cells
    (d) cells of Leydig

(b) beta-cells of Langerhans

  1. What is the cause of Addison’s disease?
    (a) hyposecretion of gonads
    (b) hyposecretion of adrenal gland
    (c) hypertrophy of kidney
    (d) hyposecretion of pituitary gland

(b) hyposecretion of adrenal gland

  1. What promotes the development of adult characteristics in a moulting insect?
    (a) Thyroxine
    (b) Ecdysone
    (c) Pheromone
    (d) None of these

(b) Ecdysone

  1. Why does the heartbeat increase at the time of an interview?
    (a) renin
    (b) rennin
    (c) adrenaline
    (d) Diuretic ADH

(c) adrenaline

  1. What hormone is secreted by the corpus luteum?
    (a) prolactin
    (b) progesterone
    (c) aldosterone
    (d) testosterone

(b) progesterone

  1. What secretes cortisol?
    (a) pancreas
    (b) thyroid
    (c) adrenal
    (d) thymus

(c) adrenal

  1. Which hormone is responsible for the normal sleep-wake cycle?
    (a) epinephrine
    (b) gastrin
    (c) melatonin
    (d) insulin

(c) melatonin

  1. Hormones are chemical signals that stimulate specific target tissues. In protein hormones, where are these receptors located?
    (a) Extracellular matrix
    (b) Blood
    (c) Plasma membrane
    (d) Nucleus

(c) Plasma membrane

  1. Thyroid hormone deficiency is not related to which of the following conditions?
    (a) Cretinism
    (b) Goitre
    (c) Myxoedema
    (d) Exophthalmia

(d) Exophthalmia

  1. What is the correct match between the following four glands and their accompanying description?
    (a) Thyroid – Hyperactivity in young children causes cretinism
    (b) Thymus – Starts undergoing atrophy after puberty
    (c) Parathyroid – Secretes parathyroid hormone, which promotes the movement of calcium ions from the blood into bones during calcification
    (d) Pancreas – Delta cells of the ‘islets of Langerhans’ secrete a hormone, which stimulates glycolysis in liver

(b) Thymus – Starts undergoing atrophy after puberty

  1. What is the most common way to express blood glucose?
    (a) mm. of Hg
    (b) milligram per deci litre
    (c) parts per million
    (d) gram (mg/dl) per litre

(b) milligram per deci litre

  1. Iodine is found in which of the following hormones?
    (a) Thyroxine
    (b) Testosterone
    (c) Insulin
    (d) Adrenaline

(a) Thyroxine

  1. Other endocrine glands are controlled by the pituitary gland through its tropic hormones. Which of the following endocrine glands function independently of the pituitary gland?
    (a) Thyroid
    (b) Gonads
    (c) Adrenals
    (d) Parathyroid

(d) Parathyroid

  1. In the body, which gland is concerned with salt equilibrium?
    (a) Anterior pituitary
    (b) Pancreas
    (c) Adrenal
    (d) Thyroid

(c) Adrenal

  1. An antagonistic (opposing) effect is caused by which of the following hormones?
    (a) Thyroxine and calcitonin
    (b) Insulin and glucagon
    (c) Growth hormone and epinephrine
    (d) ACTH and glucocorticoids

(b) Insulin and glucagon

  1. What is the correct description of gonadotropin activity in a normal pregnant female?
    (a) High levels of FSH and LH stimulate the thickening of the endometrium.
    (b) High levels of FSH and LH facilitate implantation of the embryo.
    (c) High level of hCG stimulates the synthesis of estrogen and progesterone.
    (d) High level of hCG stimulates the thickening of the endometrium.

(c) High level of hCG stimulates the synthesis of estrogen and progesterone.

  1. What endocrine gland is known as ‘the Throne of Immunity’?
    (a) Spleen
    (b) Thymus
    (c) Pineal
    (d) Adrenal medulla

(b) Thymus

  1. Which of the following hormone acts upon the renal tubule and blood capillaries?
    (a) Glucagon
    (b) Aldosterone
    (c) Vasopressin
    (d) Glucocorticoids

(c) Vasopressin

  1. The hormone of what results in glycogenesis?
    (a) alpha cells of pancreas
    (b) beta cells of pancreas
    (c) thyroid gland
    (d) adrenal gland

(b) beta cells of pancreas

  1. What are hormones chemically?
    (a) biogenic amines only
    (b) proteins, steroids and biogenic amines
    (c) proteins only
    (d) steroids only

(b) proteins, steroids and biogenic amines

  1. Which of the following pairs accurately matches a hormone with a disease caused by its deficiency?
    (a) Luteinizing – Failure of ovulation
    (b) Insulin – Diabetes insipidus
    (c) Thyroxine – Tetany
    (d) Parathyroid – Diabetes mellitus

(a) Luteinizing – Failure of ovulation

  1. The human placenta does not produce which of these hormones?
    (a) Human chorionic gonadotropin
    (b) Prolactin
    (c) Estrogen
    (d) Progesterone

(b) Prolactin

  1. Which of the following is a modified amino acid hormone?
    (a) Epinephrine
    (b) Progesterone
    (c) Prostaglandin
    (d) Estrogen

(a) Epinephrine

  1. Parkinson’s disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control. Which neurotransmitter is used here?
    (a) acetylcholine
    (b) norepinephrine
    (c) dopamine
    (d) GABA

(c) dopamine

  1. Somatostatin
    (a) Stimulates glucagon release while inhibiting insulin release
    (b) Stimulates the release of insulin and glucagon
    (c) Inhibits release of insulin and glucagon
    (d) Inhibits glucagon release while stimulating insulin release

(c) Inhibits release of insulin and glucagon

  1. The inner wall of the uterus is prepared for implantation by secretion of which of the following structures?
    (a) ovary
    (b) pituitary gland
    (c) corpus luteum
    (d) ovarian follicle

(c) corpus luteum

  1. What produces testosterone in humans?
    (a) tunica albuginea
    (b) leydig cell
    (c) seminiferous tubule
    (d) sertoli cell

(b) leydig cell

  1. Every organ of the body except _______ is affected by thyroxin?
    (a) Adult brain
    (b) Testis
    (c) Thyroid itself
    (d) Bones

(b) Testis

  1. Which of the following statements about the endocrine system is true?
    (a) Organs in the body like the gastrointestinal tract, heart, kidney and liver do not produce any hormones.
    (b) Non-nutrient chemicals produced by the body in trace amounts that act as an intercellular messenger are known as hormones.
    (c) Releasing and inhibitory hormones are produced by the pituitary gland
    (d) Adenohypophysis is under direct neural regulation of the hypothalamus.

(b) Non-nutrient chemicals produced by the body in trace amounts that act as an intercellular messenger are known as hormones.

  1. A pregnant female delivers a baby who suffers from stunted growth, mental retardation/low intelligence quotient and abnormal skin. What caused this?
    (a) Low secretion of growth hormone
    (b) Cancer of the thyroid gland
    (c) Over secretion of pars distalis
    (d) Deficiency of iodine in the diet

(d) Deficiency of iodine in the diet

  1. What is not a steroid hormone?
    (a) Androgen
    (b) Aldosterone
    (c) Estrogen
    (d) Relaxin

(d) Relaxin

  1. The produce or action of endocrine glands is mediated through?
    (a) Hormones
    (b) Enzymes
    (c) Minerals
    (d) Vitamins

(a) Hormones

  1. What is the function of testosterone?
    (a) It stimulates muscular growth and aggressiveness
    (b) It influences male sexual behaviour (libido)
    (c) It causes an anabolic (synthetic) effect on protein/ carbohydrate metabolism
    (d) All of these

(c) It causes an anabolic (synthetic) effect on protein/ carbohydrate metabolism

  1. Vasopressin increases the reabsorption of water and reduces urine secretion. Hence vasopressin is also called as
    (a) synovial fluid
    (b) neurotransmitter
    (c) antidiuretic hormone
    (d) growth regulating substance

(c) antidiuretic hormone

  1. Which of the following is a hormone produced by the pituitary gland that can be produced in both men and women, but which is only functional in women?
    (a) vasopressin
    (b) relaxin
    (c) prolactin
    (d) somatotropic hormone

(c) prolactin

  1. What is a hormone that acts on the renal tubule and blood capillaries?
    (a) glucagon
    (b) aldosterone
    (c) vasopressin
    (d) glucocorticoids

(b) aldosterone

  1. The peptide hormone ANF is secreted from?
    (a) Gastrointestinal tract
    (b) Kidney
    (c) Post. Pituitary
    (d) None of these

(d) None of these

  1. What is the function of the thyroid hormone calcitonin?
    (a) lowers calcium levels in the blood
    (b) elevates calcium levels in the blood
    (c) has no effect on calcium
    (d) elevates potassium level in blood

(a) lowers calcium levels in the blood

  1. What is insulin’s and adrenaline’s target organ?
    (a) heart
    (b) lungs
    (c) liver
    (d) pancreas

(b) lungs

  1. Mainly, which hormones control the menstrual cycle in humans?
    (a) FSH
    (b) LH
    (c) FSH, LH, estrogen
    (d) Progesterone

(c) FSH, LH, estrogen

  1. Oxytocin in human adult females
    (a) is secreted by the anterior pituitary
    (b) stimulates the growth of mammary glands
    (c) stimulates the pituitary to secrete vasopressin
    (d) causes strong uterine contractions during parturition

(d) causes strong uterine contractions during parturition

  1. Glucagon is secreted from which cells of Islets of Langerhans?
    (a) alpha-cells
    (b) beta-cells
    (c) gamma-cells
    (d) Both alpha and beta-cells

(a) alpha-cells


Other Chapters:

Class 11

Class 12


Good luck Medicoholics! Until next time.

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