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NEET • BIOLOGY • BODY FLUIDS AND CIRCULATION

Body fluids and circulation practice · Mixed difficulty

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Showing 1-30 of 335 questions

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1 Easy
1 of 335
Understanding +4 | -1
In ABO blood grouping, person with blood group O−{O^ - } can accept blood from
View answer and explanation
Correct option: D
O−{O^ - }
Option D (O−{O^ - }) is correct because O−{O^ - } blood group lacks A, B, and Rh antigens, so it can only receive blood from other O−{O^ - } individuals.
2 Medium
2 of 335
Application +4 | -1
On a beautiful sunny day, a man went for jogging and climbed few stairs in the park. His heart starts beating 95 times per minute. In left ventricle, the volume of blood at the end of ventricular systole is 60  mL60 \,\mathrm{~mL} whereas the volume of blood at the end of ventricular diastole was 140  mL140 \,\mathrm{~mL}. What is the cardiac output in this person?
View answer and explanation
Correct option: D
7600  mL/min7600\, \mathrm{~mL} / \mathrm{min}
Option D (7600  mL/min7600\, \mathrm{~mL} / \mathrm{min}) is correct because stroke volume is the difference between end-diastolic and end-systolic volumes (140 mL - 60 mL = 80 mL). Cardiac output is stroke volume multiplied by heart rate, so cardiac output = 80 mL/beat * 95 beats/min = 7600 mL/min.
3 Hard
3 of 335
Understanding +4 | -1
Which area allows the atria to completely empty as the ventricles fill with blood?
View answer and explanation
Correct option: A
A-V node
Option A (A-V node) is correct because the A-V node delays the impulse, allowing the atria to completely empty before the ventricles contract.
4 Medium
4 of 335
Remembering +4 | -1
Serum is
View answer and explanation
Correct option: C
Fluid in blood from which blood cells and fibrinogen are removed
Option C (Fluid in blood from which blood cells and fibrinogen are removed) is correct because serum is plasma without clotting factors, specifically fibrinogen.
5 Medium
5 of 335
Understanding +4 | -1
Identify the wrong statement with reference to the gene ‘I’ that controls ABO blood groups
View answer and explanation
Correct option: C
When IA  and  IB{\mathrm{I}^\mathrm{A}}\,\,\mathrm{and}\,\,{\mathrm{I}^\mathrm{B}} are present together, they express same type of sugar.
Option C (When IA  and  IB{\mathrm{I}^\mathrm{A}}\,\,\mathrm{and}\,\,{\mathrm{I}^\mathrm{B}} are present together, they express same type of sugar) is wrong because when IA and IB are present together, they express different types of sugar (both A and B antigens).
6 Medium
6 of 335
Understanding +4 | -1
The action potential is conducted to the ventricles by AVN. Damage to AVN results in
View answer and explanation
Correct option: B
Heart block
Option B (Heart block) is correct because damage to the AVN disrupts the conduction of action potentials to the ventricles, leading to heart block.
7 Easy
7 of 335
Remembering +4 | -1
Purkinje fibres are present in
View answer and explanation
Correct option: B
Heart
Option B (Heart) is correct because Purkinje fibers are specialized conductive fibers located in the ventricles of the heart.
8 Medium
8 of 335
Analyzing +4 | -1
Find out the INCORRECT one
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because all the statements are incorrect: veins have a wider lumen than arteries, pulmonary circulation involves both deoxygenated and oxygenated blood, and tunica media is thicker in arteries than in veins.
9 Easy
9 of 335
Remembering +4 | -1
Which of the following is responsible for decrease the rate of heart beat
View answer and explanation
Correct option: B
parasympathetic neural signals
Option B (parasympathetic neural signals) is correct because parasympathetic nervous system activity decreases heart rate.
10 Medium
10 of 335
Understanding +4 | -1
Which of the following set of blood vessels shows deoxygenated blood?
View answer and explanation
Correct option: B
Systemic vein and pulmonary artery
Option B (Systemic vein and pulmonary artery) is correct because systemic veins carry deoxygenated blood from the body to the heart, and the pulmonary artery carries deoxygenated blood from the heart to the lungs.
11 Medium
11 of 335
Remembering +4 | -1
ECG is a measure of
View answer and explanation
Correct option: A
Rate of heart beat
Option A (Rate of heart beat) is correct because an ECG measures the electrical activity of the heart, which can be used to determine the heart rate.
12 Easy
12 of 335
Understanding +4 | -1
Which one of the following is a correct matching pair?
View answer and explanation
Correct option: A
Lubb – Sharp closure of AV valves at the beginning of ventricular systole
Option A (Lubb – Sharp closure of AV valves at the beginning of ventricular systole) is correct because the "Lubb" sound corresponds to the closing of the atrioventricular valves.
13 Medium
13 of 335
Understanding +4 | -1
Which one of the following statements is correct regarding blood pressure?
View answer and explanation
Correct option: D
140/90 mm Hg may harm vital organs like brain and Kidney
Option D (140/90 mm Hg may harm vital organs like brain and Kidney) is correct because a blood pressure reading of 140/90 mm Hg or higher is considered hypertension and can damage vital organs.
14 Medium
14 of 335
Analyzing +4 | -1
Read the following four statements

1) The second heart sound is DUB, which is associated with the closure of bicuspid and tricuspid valves

2) The duration between consecutive second and first heart sound is 0.5 seconds in a cardiac cycle

3) The heartbeat of a human increase when the adrenaline hormone is injected into it

4) The atrial systole in a cardiac cycle increases the flow of blood into the respective ventricle by about 70%70 \%

How many of the above statements are incorrect?
View answer and explanation
Correct option: C
2
Option C (2) is correct because two of the statements provided are factually incorrect regarding heart sounds, timing, hormonal effects, and atrial systole contribution.
15 Medium
15 of 335
Understanding +4 | -1
Consider the following statement regarding ABOABO blood group in human
I. It is controlled by multiple allele
II. It shows codominance
III. Codominance can be manifested phenotypically in human
IV. It follows the Mendel law of inheritance
Which of the following statements (s) are correct?
View answer and explanation
Correct option: B
I and II are correct
Option B (I and II are correct) is correct because ABO blood group inheritance is controlled by multiple alleles (IA, IB, i) and shows codominance (IA and IB are both expressed when present together).

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16 Easy
16 of 335
Remembering +4 | -1
Prothrombin is
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because prothrombin is synthesized in the liver, its production is vitamin K-dependent, and it is converted to thrombin by prothrombinase.
17 Easy
17 of 335
Remembering +4 | -1
Name the artery which carries deoxygenated blood
View answer and explanation
Correct option: A
Pulmonary artery
Option A (Pulmonary artery) is correct because the pulmonary artery carries deoxygenated blood from the right ventricle to the lungs.
18 Medium
18 of 335
Analyzing +4 | -1
Assertion: Atria receive the signal for contraction subsequently the blood in them flows to ventricles.

Reason: Action potential generated at the atrio ventricular node passes from atria to ventricles.
View answer and explanation
Correct option: C
If, the assertion is true but the reason is false.
Option C (If, the assertion is true but the reason is false) is correct because the atria do contract and push blood into the ventricles, but the action potential originates at the sinoatrial (SA) node, not the atrioventricular (AV) node, and then spreads to the AV node.
19 Easy
19 of 335
Understanding +4 | -1
A substance present over the surface of RBCs and is genetically heritable is called as
View answer and explanation
Correct option: D
None of these
Option D (None of these) is correct because the substance present on the surface of RBCs and genetically heritable is called an antigen, specifically a blood group antigen, and none of the provided options are correct.
20 Medium
20 of 335
Remembering +4 | -1
The coagulum is mainly formed of a network of threads called in which dead and damaged formed elements of blood are trapped
View answer and explanation
Correct option: B
Fibrins
Option B (Fibrins) is correct because the coagulum (blood clot) is mainly composed of a network of fibrin threads, which trap blood cells and other formed elements.
21 Medium
21 of 335
Understanding +4 | -1
Which of the following statements is true for lymph?
View answer and explanation
Correct option: B
All components of blood except RBCs and some proteins
Option B (All components of blood except RBCs and some proteins) is correct because lymph is derived from interstitial fluid, which is blood plasma that has filtered out of capillaries, lacking RBCs and larger proteins.
22 Medium
22 of 335
Understanding +4 | -1
SAN generates an action potential which stimulates both the …A… to undergo a simultaneous contraction called …B… . This increases the flow of the blood into the ventricles by about …C… percentage
Choose the correct option for A, B and C
View answer and explanation
Correct option: A
A-atria, B-asterial systole, C-30
Option A (A-atria, B-asterial systole, C-30) is correct because the SAN stimulates both atria to undergo atrial systole, increasing blood flow into the ventricles by about 30%.
23 Medium
23 of 335
Remembering +4 | -1
Closed circulatory system is present in
View answer and explanation
Correct option: A
Annelids and chordates
Option A (Annelids and chordates) is correct because both annelids (e.g., earthworms) and chordates (e.g., vertebrates) have closed circulatory systems.
24 Hard
24 of 335
Understanding +4 | -1
Assertion: Blood pressure is arterial blood pressure.
Reason: Blood pressure is measured by sphygmomanometer.
View answer and explanation
Correct option: B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
Option B (If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion) is correct because both statements are true, but the sphygmomanometer's use doesn't explain why blood pressure is arterial.
25 Medium
25 of 335
Understanding +4 | -1
Which of the following statement (s) is/are incorrect?
I. The AV node and the bundle of His constitute, the electrical link between the atria and the ventricles
II. The bundle of His is a bundle of electrical nodes which allows the ventricles to contract
III. The bundle of His is a group of fibres that carry the electrical impulses through the centre of the heart
IV. The bundle of His is located in the artrial region
Choose the correct option
View answer and explanation
Correct option: D
I, II and III
Option A (II, III and IV) is correct because statements II, III, and IV contain inaccuracies about the bundle of His.
26 Hard
26 of 335
Understanding +4 | -1
Assertion: When there is a fall in the blood pressure due to loss of blood volume, this is compensated by vasoconstriction of veins.
Reason: Veins hold the extra amount of blood which can be shifted to the arteries as required.
View answer and explanation
Correct option: A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
Option A is correct because both the assertion and the reason are correct, and the reason correctly explains why vasoconstriction of veins compensates for a fall in blood pressure due to blood loss: veins act as a reservoir.
27 Medium
27 of 335
Understanding +4 | -1
When the blood of a foetus is agglutinated by its mother’s Rh antibodies, then which of the following condition arises as a severe anaemia?
View answer and explanation
Correct option: C
Erythroblastosis foetalis
Option C (Erythroblastosis foetalis) is correct because it is the condition that arises when the foetus's blood is agglutinated by the mother's Rh antibodies, leading to severe anemia.
28 Hard
28 of 335
Understanding +4 | -1
Read the following features w.r.t formed elements.

(i) Cellular fragments of megakaryocytes

(ii) Release certain factors for clotting of blood

(iii) Their deficiency causes clotting disorders

Above features are represented by
View answer and explanation
Correct option: C
Thrombocytes
Option C (Thrombocytes) is correct because thrombocytes (platelets) are cellular fragments of megakaryocytes and are essential for blood clotting.
29 Medium
29 of 335
Analyzing +4 | -1
Which of the following is least likely to be caused by reduced blood/oxygen supply to heart muscles?
View answer and explanation
Correct option: A
Atherosclerosis
Option A (Atherosclerosis) is correct because atherosclerosis is the underlying condition that *causes* reduced blood/oxygen supply to the heart, while the other options are *results* of that reduced supply.
30 Hard
30 of 335
Understanding +4 | -1
Which of the following statement is incorrect?
View answer and explanation
Correct option: C
In a person with Blood group A antigen A is present in the plasma
Option C (In a person with Blood group A antigen A is present in the plasma) is correct because in a person with blood group A, antigen A is present on the red blood cells, and antibody B is present in the plasma, not antigen A.
Revision notes and key takeaways

Review BODY FLUIDS AND CIRCULATION in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

  • ✓ This set contains 335 single-correct-answer MCQs on BODY FLUIDS AND CIRCULATION.
  • ✓ Try each question before opening its answer. Read the explanation where one is available.
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