Body Fluids and Circulation: NEET MCQ Questions [100+ Solved]

Below are the NEET MCQ questions on Class 11 Biology Chapter “Body Fluids and Circulation” 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.

“Body Fluids and Circulation” is the 18th 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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In the human body, which of the following organs is the blood bank?
(a) Heart
(b) Lungs
(c) Spleen
(d) Liver

What is a matching pair of a certain body feature and its value/count in a normal adult human?
(a) Urea 5-10 mg / 100 ml of blood
(b) Blood sugar (fasting) – 70-100 mg/100 ml
(c) Total blood volume – 5-6
(d) ESR in Wintrobe method – 9-15 mm in males and 20-34 mm in females

(b) Blood sugar (fasting) – 70-100 mg/100 ml

Bulk of carbon dioxide (CO2) released from body tissues into the blood is present as?
(a) 70% carbamino-haemoglobin and 30% as bicarbonate
(b) carbamino-haemoglobin in RBCs
(c) bicarbonate in blood plasma and RBCs
(d) free CO2 in blood plasma

A cardiac pacemaker fails to function normally in a patient. A pacemaker is to be grafted into him by the doctors. The graft will likely be placed at the site of?
(a) Atrioventricular bundle
(b) Purkinje system
(c) Sinuatrial node
(d) Atrioventricular node

A marriage between what types of man and woman would lead to child death?
(a) Rh+ man and Rh+ woman
(b) Rh+ man and Rh– woman
(c) Rh– man and Rh– woman
(d) Rh– man and Rh+ woman

(b) Rh+ man and Rh– woman

Fat and calcium deposition in the arteries causes a blockage called?
(a) Arteriosclerosis
(b) Atherosclerosis
(c) Emphysema
(d) Heart syndrome

(b) Atherosclerosis

Which one of the following doctors performed the first heart transplant?
(a) Hargovind Khurana
(b) Christian Barnard
(c) Watson
(d) William Harvey

(b) Christian Barnard

What is QRST related to?
(a) Ventricular contraction or depolarization
(b) Auricular contraction
(c) Auricular relaxation
(d) Cardiac cycle

(a) Ventricular contraction or depolarization

To prevent excessive rises in blood pressure, a person with high blood pressure should take which of the following precautions?
(a) sleep as much as possible
(b) avoid standing
(c) increase their weight
(d) avoid emotional disturbances and excitement

(d) avoid emotional disturbances and excitement

What would be the condition of people who have migrated from the planes to an area adjoining Rohtang Pass about six months back?
(a) have more RBCs and their haemoglobin has a lower binding affinity to O2.
(b) are not physically fit to play games like football.
(c) suffer from altitude sickness with symptoms like nausea, fatigue, etc.
(d) have the usual RBC count but their haemoglobin has a very high binding affinity to O2.

(a) have more RBCs and their haemoglobin has a lower binding affinity to O2.

In humans, what is true about RBCs?
(a) They carry about 20–25 per cent of CO2
(b) They transport 99.5 per cent of O2
(c) They transport about 80 per cent of oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma
(d) They do not carry CO2 at all

(a) They carry about 20–25 per cent of CO2

What will be the immediate effect if the chordae tendineae of the tricuspid valve of the human heart is partially non – functional due to some injury?
(a) The flow of blood into the aorta will be slowed down
(b) The ‘pacemaker’ will stop working
(c) The blood will tend to flow back into the left atrium
(d) The flow of blood into the pulmonary artery will be reduced

(d) The flow of blood into the pulmonary artery will be reduced

ABO blood groups in humans are controlled by the gene I. It has three alleles – IA IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
(a) Three
(b) One
(c) Four
(d) Two

Human blood plasma contains globulins that are primarily involved in what?
(a) osmotic balance of body fluids
(b) oxygen transport in the blood
(c) clotting of blood
(d) defence mechanisms of the body

(d) defence mechanisms of the body

Which of the following alphabets represents the respective human heart’s activity in a standard ECG?
(a) S – start of systole
(b) T – end of diastole
(c) P – depolarisation of the atria
(d) R – repolarisation of ventricles

ECG depicts the depolarisation and repolarisation processes during the cardiac cycle. In the ECG of a normal healthy individual, which one of the following waves is not represented?
(a) Depolarisation of atria
(b) Repolarisation of atria
(c) Depolarisation of ventricles
(d) Repolarisation of ventricles

(b) Repolarisation of atria

What type of cell lacks a nucleus?
(a) RBC
(b) Neutrophils
(c) Eosinophils
(d) Erythrocytes

(a) RBC

Antibodies are produced by which of the following blood cells?
(a) B-lymphocytes
(b) T-lymphocytes
(c) RBC
(d) neutrophils

(a) B-lymphocytes

Which agranulocytes are responsible for the immune response of the body?
(a) basophils
(b) neutrophils
(c) eosinophils
(d) lymphocytes

(a) basophils

The second heart sounds (dubb) are associated with the closure of?
(a) tricuspid valve
(b) semilunar valve
(c) bicuspid valve
(d) tricuspid and bicuspid valve

(b) semilunar valve

In a standard electrocardiogram, which of the following explains the phase/event in the cardiac cycle?
(a) QRS complex indicates atrial contraction
(b) QRS complex indicates ventricular contraction
(c) Time between S and T represents atrial systole
(d) P-wave indicates the beginning of ventricular contraction

(b) QRS complex indicates ventricular contraction

Which of the following statements is incorrect?
(a) A person of ‘O’ blood group has anti ‘A’ and anti ‘B’ antibodies in his blood plasma.
(b) A person of ‘B’ blood group can’t donate blood to a person of ‘A’ blood group.
(c) Blood group is designated based on the presence of antibodies in the blood plasma.
(d) A person of AB blood group is a universal recipient.

What would be the cardiac output of a person having 72 heartbeats per minute and a stroke volume of 50 mL?
(a) 360 mL
(b) 3600 mL
(c) 7200 mL
(d) 5000 mL

(b) 3600 mL

People with blood group AB are considered universal recipients because they have?
(a) both A and B antigens on RBC but no antibodies in the plasma.
(b) both A and B antibodies are in the plasma.
(c) no antigen on RBC and no antibody in the plasma.
(d) both A and B antigens in the plasma but no antibodies.

(a) both A and B antigens on RBC but no antibodies in the plasma.

How do parasympathetic neural signals affect the working of the heart?
(a) Reduce both heart rate and cardiac output.
(b) Heart rate is increased without affecting the cardiac output.
(c) Both heart rate and cardiac output increase.
(d) Heart rate decreases but cardiac output increases.

(a) Reduce both heart rate and cardiac output.

Which one of the following is correct?
(a) Serum = Blood + Fibrinogen
(b) Lymph = Plasma + RBC + WBC
(c) Blood = Plasma + RBC + WBC
(d) Plasma = Blood – Lymphocytes

Where does erythropoiesis start?
(a) Liver
(b) Spleen
(c) Red bone marrow
(d) Kidney

When is blood pressure in the mammalian aorta maximum?
(a) Diastole of the right ventricle
(b) Systole of the left ventricle
(c) Diastole of the right atrium
(d) Systole of the left atrium

(b) Systole of the left ventricle

Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. When is the second sound heard?
(a) Ventricular wall vibrates due to gushing in of blood from atria
(b) Semilunar valves close down after the blood flows into vessels from ventricles
(c) AV node receives a signal from SA node
(d) AV valves open up

(b) Semilunar valves close down after the blood flows into vessels from ventricles

What animal has two separate circulatory pathways?
(a) Lizard
(b) Whale
(c) Shark
(d) Frog

(b) Whale

The blood pressure in the pulmonary artery is?
(a) same as that in the aorta.
(b) more than that in the carotid.
(c) more than that in the pulmonary vein.
(d) less than that in the venae cavae.

Lymph is different from blood as it has?
(a) plasma without proteins
(b) more WBCs and no RBCs
(c) more RBCs and fewer WBCs
(d) no plasma

(b) more WBCs and no RBCs

The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC as the “O” in it refers to having?
(a) overdominance of this type on the genes for A and B types
(b) one antibody only – either anti – A or anti- B on the RBC;
(c) no antigens A and B on RBCs
(d) other antigens besides A and B on RBCs

In humans, why does the blood passes from the post caval to the diastolic right atrium of the heart?
(a) open of the venous valves
(b) suction pull
(c) stimulation of the sino auricular node
(d) the pressure difference between the post caval and atrium

(b) suction pull

In mammals, where do lymph vessels ultimately pour their contents?
(a) hepatic portal vein
(b) artery entering into the spleen
(c) anterior veins close to the right auricle
(d) sciatic vein

Which of the following represents pulmonary circulation?
(a) In auricle (oxygenated blood) – lungs (deoxygenated blood) – Right auricle
(b) Left auricle (deoxygenated blood) – lungs (oxygenated blood) – Right auricle
(c) Left auricle (oxygenated blood) – lungs (deoxygenated blood) – Left auricle
(d) Right auricle (deoxygenated blood) – lungs (oxygenated blood) – Left auricle

(d) Right auricle (deoxygenated blood) – lungs (oxygenated blood) – Left auricle

What does systemic heart refer to?
(a) the two ventricles together in humans
(b) the heart that contracts under stimulation from the nervous system
(c) left auricle and left ventricle in higher vertebrates
(d) entire heart in lower vertebrates

Blood must be drawn from a patient and kept in a test tube for analysis of corpuscles and plasma. The following four types of test tubes are provided to you. Which one will you not use for this purpose?
(a) Test tube containing calcium bicarbonate
(b) Chilled test-tube
(c) Test tube containing heparin
(d) Test tube containing sodium oxalate

(a) Test tube containing calcium bicarbonate

Using the ABO blood group system, if both antigens are present but no antibody, what is the individual’s blood group?
(a) B
(b) O
(c) AB
(d) A

What is the true statement about lymph?
(a) WBC and serum
(b) All components of blood except RBCs and some proteins
(c) RBCs, WBCs and plasma
(d) RBCs proteins and platelets

(b) All components of blood except RBCs and some proteins

What is true about leucocytes?
(a) Their sudden fall in number is an indication of blood cancer
(b) These are produced in the thymus
(c) These are enucleated
(d) These can squeeze out through the capillary walls

(d) These can squeeze out through the capillary walls

The pulmonary artery differs from the pulmonary vein in that it has?
(a) no endothelium
(b) valves
(c) large lumen
(d) thick muscular walls

(d) thick muscular walls

What is the most accurate statement about blood constituents and respiratory gas transport?
(a) RBCs transport oxygen whereas WBCs transport CO2
(b) RBCs transport oxygen whereas plasma transports only CO2
(c) RBCs as well as WBCs transport both oxygen and CO2
(d) RBCs as well as plasma transport both oxygen and CO2

(d) RBCs as well as plasma transport both oxygen and CO2

What is the purpose of lymph?
(a) transport oxygen to the brain
(b) transport carbon dioxide to the lungs
(c) return the interstitial fluid to the blood
(d) return the WBCs and RBCs to the lymph nodes

Where is the enzyme carbonic anhydrase found?
(a) Lymphocytes
(b) Blood plasma
(c) RBC
(d) Leucocytes

Which of the following statements is true about blood pressure?
(a) 130/90 mmHg is considered high and requires treatment
(b) 100/55 mmHg is considered an ideal blood pressure
(c) 105/50 mm Hg makes one very active
(d) 90/110 mmHg may harm vital organs like the brain and kidney

(d) 90/110 mmHg may harm vital organs like the brain and kidney

What is the function of the vessels – arteries?
(a) supply oxygenated blood to the different organs
(b) break up into capillaries which reunite to form one visceral organ
(c) break up into capillaries which reunite to form a vein
(d) carry blood from one visceral organ to another visceral organ

(b) break up into capillaries which reunite to form one visceral organ

What plasma protein is involved in blood coagulation?
(a) an albumin
(b) serum amylase
(c) a globulin
(d) fibrinogen

(d) fibrinogen

In humans, the ‘Bundle of His’ is a part of which organ?
(a) Brain
(b) Heart
(c) Kidney
(d) Pancreas

(b) Heart

What are the most active phagocytic white blood cells?
(a) neutrophils and eosinophils
(b) lymphocytes and macrophages
(c) eosinophils and lymphocytes
(d) neutrophils and monocytes

(d) neutrophils and monocytes

Histamine and the natural anti-coagulant heparin are released by what type of white blood cells?
(a) Neutrophils
(b) Basophils
(c) Eosinophils
(d) Monocytes

(b) Basophils

A drop of each of the following, is placed on four slides separately. Which one will not coagulate?
(a) Blood serum
(b) Sample from the thoracic duct of the lymphatic system
(c) Whole blood from the pulmonary vein
(d) Blood plasma

(a) Blood serum

Examination of the blood of a person suspected of having anaemia, shows large, immature, nucleated erythrocytes without haemoglobin. His symptoms are likely to be alleviated by supplementing his diet with which of the following?
(a) Folic acid and cobalamine
(b) Riboflavin
(c) Iron compounds
(d) Thiamine

(a) Folic acid and cobalamine

There is a road accident patient with an unknown blood group who requires an immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?
(a) Blood group B
(b) Blood group AB
(c) Blood group O
(d) Blood group A

In comparison to those of humans, how are frog erythrocytes?
(a) Without nucleus but with haemoglobin
(b) Nucleated and with haemoglobin
(c) Very much smaller and fewer
(d) Nucleated and without haemoglobin

(b) Nucleated and with haemoglobin

Phagocytosis does not occur in which of the following cells?
(a) Monocytes
(b) Neutrophil
(c) Basophil
(d) Macrophage

What is one of the most common symptoms observed in people infected with dengue fever?
(a) significant decrease in RBCs count
(b) significant decrease in WBC count
(c) significant decrease in platelets count
(d) significant increase in platelets count

When a cardiac cycle occurs, which of the following is incorrect?
(a) The volume of blood pumped out by the Rt and Lt ventricles is the same
(b) The volume of blood pumped out by the Rt and Lt ventricles is different
(c) The volume of blood received by each atrium is different
(d) The volume of blood received by the aorta and pulmonary artery is different

(a) The volume of blood pumped out by the Rt and Lt ventricles is the same

The autonomous neutral system could moderate cardiac activity. Select the correct answer.
(a) The parasympathetic system stimulates the heart rate and stroke volume
(b) The sympathetic system stimulates the heart rate and stroke volume
(c) The parasympathetic system decreases the heart rate but increases stroke volume
(d) The sympathetic system decreases the heart rate but increases stroke volume

(b) The sympathetic system stimulates the heart rate and stroke volume

Distribution of some injectible material/medicine most rapidly and without any risks can be achieved by injecting it into?
(a) Muscles
(b) Arteries
(c) Veins
(d) Lymph vessels

Which of the following’s characteristics include a neurogenic heart?
(a) Lower vertebrates
(b) Humans
(c) Rat
(d) Rabbit

(a) Lower vertebrates

What accelerates heartbeats?
(a) Cranial nerves and acetylcholine
(b) Sympathetic nerves and acetylcholine
(c) Cranial nerves and adrenaline
(d) Sympathetic nerves and epinephrine

(d) Sympathetic nerves and epinephrine

What is the condition called when the heartbeat increases?
(a) Bradycardia
(b) Tachy cardia
(c) Leucopenia
(d) Cardiac arrest

(b) Tachy cardia

Where are the Purkinje fibres found?
(a) Brain
(b) Skin
(c) Conduction system of the heart
(d) Nephrons of kidney

How much time does the cardiac cycle in man take?
(a) 0.5 seconds
(b) 1.0 second
(c) 1.2 seconds
(d) 0.8 seconds

(d) 0.8 seconds

What is the first animal in the evolution of animals to have a heart that pumps blood?
(a) Annelids
(b) Roundworms
(c) Arthropods
(d) Flatworms

(a) Annelids

What does the ‘T’ wave represent in the ECG?
(a) diastole of auricles
(b) diastole of ventricles
(c) systole of ventricles
(d) diastole of auricles and ventricles

(d) diastole of auricles and ventricles

A layer of single cells is found in which of the following?
(a) Blood capillary
(b) Artery
(c) Venule
(d) Vessels

(a) Blood capillary

Which blood protein maintains normal blood pressure in a man?
(a) Haemoglobin
(b) Albumin
(c) Fibrinogen
(d) Heparin

(b) Albumin

Where are chordae tendineae found?
(a) Joints of legs
(b) atria of heart
(c) ventricles of brain
(d) ventricles of heart

(d) ventricles of heart

In response to which of the following does the blood pressure increase and heart rate decrease?
(a) Exercise
(b) Haemorrhage
(c) Exposure to high altitude
(d) Increased intracranial pressure

(d) Increased intracranial pressure

Why is it that the systolic pressure of the heart is higher than diastolic pressure?
(a) blood is forcefully pumped into arteries by the heart during systole and not during diastole
(b) arteries offer resistance to the flowing of blood during systole only
(c) arteries contract during systole only.
(d) the volume of blood in the heart is greater during systole than during diastole.

(a) blood is forcefully pumped into arteries by the heart during systole and not during diastole

What organ receives only oxygenated blood?
(a) Liver
(b) Pancreas
(c) Kidney
(d) Gills

(b) Pancreas

What is the normal blood pressure in an adult?
(a) 80/120 mm Hg
(b) 100/80 mm Hg
(c) 120/80 mm Hg
(d) 100/120 mm Hg

In the blood, the majority of carbon dioxide (CO2) is released from body tissues as?
(a) bicarbonate in blood plasma and RBCs
(b) free CO2 in blood plasma
(c) 70% carbamino- haemoglobin and 30% as bicarbonate
(d) carbamino-haemoglobin in RBCs

(a) bicarbonate in blood plasma and RBCs

Given below is the ECG of a normal human. What is the correct interpretation of one of its components in humans?
(a) Complex QRS-One complete Pulse
(b) Peak T – Initiation of total cardiac contraction
(c) Peak P and Peak R together-Systolic and diastolic blood pressures
(d) Peak P- Initiation of left atrial contraction only

Which among the following is essential for the coagulation of blood?
(a) heparin and calcium ions
(b) calcium ions and platelet factors
(c) oxalates and nitrates
(d) platelet factors and heparin

(b) calcium ions and platelet factors

Adult human RBCs are enucleated. Which of the following statement(s) is/are the most appropriate explanation for this feature?
a They do not need to reproduce
b They are somatic cells
c They do not metabolize
d All their internal space is available for oxygen transport

(a) only a
(b) a, c and d
(c) b and c
(d) only d

(d) only d

What does Anti-serum contain?
(a) antigens
(b) antibodies
(c) leucocytes
(d) RBCs

(b) antibodies

During fibrinolysis, which enzyme induces lysis of fibrinogen to fibrin?
(a) Plasmin
(b) Thrombin
(c) Fibrin
(d) Trypsin

(b) Thrombin

What blood group is suitable for all patients?
(a) A
(b) B
(c) O
(d) AB

The thickest muscular wall of the heart is found in which chamber?
(a) Left auricle
(b) Left ventricle
(c) Right ventricle
(d) Right auricle

(b) Left ventricle

Which pair of items have the same meaning?
(a) Malleus – Anvil
(b) SA node – Pacemaker
(c) Leucocytes – Lymphocytes
(d) Haemophilia – Blood cancer

(b) SA node – Pacemaker

An artificial pacemaker is implanted subcutaneously and connected to the heart in patients
(a) having 90% blockage of the three main coronary arteries.
(b) having very high blood pressure.
(c) with irregularity in the heart rhythm.
(d) suffering from arteriosclerosis.

What is hirudin?
(a) A protein produced by Hordeum vulgare, which is rich in lysine.
(b) A toxic molecule isolated from Gossypium hirsutum, which reduces human fertility.
(c) A protein produced from transgenic Brassica napus, which prevents blood clotting.
(d) An antibiotic produced by a genetically engineered bacterium, Escherichia coli.

Which component of blood prevents it from coagulating in the blood vessels?
(a) haemoglobin
(b) plasma
(c) thrombin
(d) heparin

(d) heparin

The thickening of arteries caused by cholesterol deposition is called?
(a) arteriosclerosis
(b) rheumatic heart
(c) blood pressure
(d) cardiac arrest.

(a) arteriosclerosis

Which of the following pairs is a matching pair?
(a) Lubb – Sharp closure of AV valves at the beginning of ventricular systole.
(b) Dup – Sudden opening of semilunar valves at the beginning of ventricular diastole.
(c) Pulsation of the radial artery valves in the blood vessels.
(d) Purkinje fibres-Initiation of the heartbeat.

(a) Lubb – Sharp closure of AV valves at the beginning of ventricular systole.

Lymph node malfunctions would most likely interfere with?
(a) release of carbon dioxide into the lymph
(b) filtering of glucose from the lymph
(c) release of oxygen into the lymph
(d) filtering of bacteria from the lymph

(d) filtering of bacteria from the lymph

What are the arteries that supply blood to the heart called?
(a) carotid arteries
(b) hepatic arteries
(c) coronary arteries
(d) pulmonary arteries

During a serious accident, a man whose blood group is unknown needs an immediate blood transfusion. Which one of the following blood groups that is readily available at the hospital safe for transfusion?
(a) O, Rh–
(b) O, Rh+
(c) AB, Rh–
(d) AB, Rh+

(b) O, Rh+

What statement is true about a normal person’s blood?
(a) Compared to arteries, veins are less numerous and hold less of the body’s blood at any given time.
(b) Blood cells constitute about 70 percent of the total volume of the blood.
(c) White blood cells (WBC) are made by lymph nodes only.
(d) The blood has more platelets than WBC.

(d) The blood has more platelets than WBC.

Given below are four statements (a-d) regarding the human blood circulatory system
(1) Arteries are thick-walled and have narrow lumen as compared to veins
(2) Angina is acute chest pain when the blood circulation to the brain is reduced
(3) Persons with blood group AB can donate blood to any person with any blood group under the ABO system
(4) Calcium ions play a very important role in blood clotting
Which two of the above statements are correct?
(a) (1) and (4)
(b) (1) and (2)
(c) (2) and (3)
(d) (3) and (4)

(a) (1) and (4)

Which one of the following engulfs pathogens rapidly?
(a) Acidophils
(b) Monocytes
(c) Basophils
(d) Neutrophils

(d) Neutrophils

What is the breakdown product of haemoglobin?
(a) Bilirubin
(b) Iron
(c) Biliverdin
(d) Calcium

(b) Iron

The Bundle of His is a network of?
(a) nerve fibres found throughout the heart
(b) muscle fibres distributed throughout the heart walls
(c) muscle fibres found only in the ventricle wall
(d) nerve fibres distributed in ventricles

What is the pacemaker of the human heart?
(a) SA node
(b) tricuspid valve
(c) AV node
(d) SV node

(a) SA node

What does the pulmonary artery carry?
(a) deoxygenated blood from the heart to the lungs
(b) deoxygenated blood from the lungs to the heart
(c) oxygenated blood from the heart to the lungs
(d) oxygenated blood from the lungs to the heart

(a) deoxygenated blood from the heart to the lungs

In which of the following is a four-chambered heart not found?
(a) Mammals
(b) Birds
(c) Snake
(d) Crocodile

To convert prothrombin into active thrombin by thromboplastin, which cation is required?
(a) Cu2+
(b) Fe3+
(c) Fe2+
(d) Ca2+

(d) Ca2+

What is the blood protein involved in blood coagulation?
(a) Heparin
(b) Prothrombin
(c) Thrombin
(d) All of these

(b) Prothrombin

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