A protein produced by Hordeum vulgare, which is rich in lysine

A toxic molecule isolated from Gossypium hirsutum, which reduces human fertility

An antibiotic produced by a genetically engineered bacterium, Escherichia coli

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NEET • BIOLOGY • BODY FLUIDS AND CIRCULATION

Body fluids and circulation practice · Hard

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Showing 1-30 of 46 questions

1 Hard

1 of 46

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.

2 Hard

2 of 46

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.

3 Hard

3 of 46

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.

4 Hard

4 of 46

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.

5 Hard

5 of 46

Understanding +4 | -1

Which of the following statement is incorrect?

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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.

6 Hard

6 of 46

Understanding +4 | -1

Read the following statement and choose the correct one w.r.t to Erythrocyte

(i) A healthy adult man has on an average 5 million to 5.5 million of

{RBC} \,{mm}^{-3}

of blood

(ii) RBC are devoid of nucleus in most of the mammals and are biconvex in shape

(iii) RBCs have an average life span of 120 days

(iv) RBC are formed in lungs

View answer and explanation

Correct option: A

Only (i), (iii)

Option A (Only (i), (iii)) is correct because a healthy adult man has 5-5.5 million RBCs per mm3 of blood, RBCs have an average lifespan of 120 days, but RBCs are enucleated in mammals, and they are formed in the red bone marrow, not the lungs.

7 Hard

7 of 46

Understanding +4 | -1

[A]: Blood pressure can be measured with a sphygmomanometer in the arm.

[R]: In our body, blood flows with a great pressure only through arms.

View answer and explanation

Correct option: C

A is true but R is false

Option C (A is true but R is false) is correct because blood pressure can indeed be measured with a sphygmomanometer in the arm, but blood does not flow with greater pressure only through the arms.

8 Hard

8 of 46

Remembering +4 | -1

Thrombocytes are derived from_____present in red bone marrow. Choose the option which fills the blank correctly.

View answer and explanation

Correct option: D

Megakaryocytes

Option D is correct because thrombocytes (platelets) are derived from megakaryocytes, which are large cells present in the red bone marrow.

9 Hard

9 of 46

Understanding +4 | -1

Which of the following sentences is correct? I. ECG is of a great clinical significance
II. Electrocardiograph is the recording of electrical changes during the cardiac cycle
III. To obtain a standard ECG, a patient is connected to the machine with 3 electrical electrodes (one to each wrist and to the left ankle)
IV. Normal activities of the heart are regulated intrinsically
V. Electrocardiogram is the electrical activity of heart
The option with correct statements is

View answer and explanation

Correct option: B

I, III, IV and V

Option D (I, II, IV and V) is correct because statements I, II, IV, and V are accurate descriptions of ECG and heart function, while statement III is incorrect.

10 Hard

10 of 46

Remembering +4 | -1

Which of the following has highest pH?

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Correct option: B

Human blood

Option B (Human blood) is correct because human blood has a pH of around 7.4, which is slightly alkaline and higher than the pH of saliva, gastric juice, and urine.

11 Hard

11 of 46

Understanding +4 | -1

Which of the following is mismatched?

View answer and explanation

Correct option: C

DUBB – Second heart sound, due to opening of semilunar valves

Option C (DUBB – Second heart sound, due to opening of semilunar valves) is correct because the second heart sound (DUBB) is due to the CLOSURE of semilunar valves, not opening.

12 Hard

12 of 46

Understanding +4 | -1

Assertion (A): The wall of left ventricle of heart is thinner than the wall of right ventricle.
Reason (R): Left ventricle requires to pump blood to lungs only.

View answer and explanation

Correct option: D

Both (A) and (R) are false

Option D (Both (A) and (R) are false) is correct because the left ventricle has a thicker wall than the right ventricle, and it pumps blood to the entire body, not just the lungs.

13 Hard

13 of 46

Remembering +4 | -1

In terms of descending order of percentage proportions of leucocytes in human blood, which one is correct?

View answer and explanation

Correct option: A

Neutrophils → lymphocytes → monocytes → eosinophils → basophils

Option A is correct because the descending order of leucocyte proportions in human blood is: Neutrophils > Lymphocytes > Monocytes > Eosinophils > Basophils.

14 Hard

14 of 46

Remembering +4 | -1

Human haemoglobin exhibits _____structure of protein. Choose the option which fills the blank correctly.

View answer and explanation

Correct option: B

Quaternary

Option B is correct because human hemoglobin exhibits a quaternary structure, which involves the arrangement of multiple polypeptide subunits.

15 Hard

15 of 46

Understanding +4 | -1

Which of the following statements is correct regarding Rh Incompatibility.

View answer and explanation

Correct option: A

Rh antigens of the foetus do not get exposed to the Rh-ve blood of the mother in the first pregnancy as the two bloods are well separated by the placenta.

Option A (Rh antigens of the foetus do not get exposed to the Rh-ve blood of the mother in the first pregnancy as the two bloods are well separated by the placenta) is correct because the placenta usually prevents mixing of foetal and maternal blood during the first pregnancy, thus preventing sensitization.

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16 Hard

16 of 46

Remembering +4 | -1

A symptom of acute chest pain is called:

View answer and explanation

Correct option: B

Angina

Option B (Angina) is correct because angina is chest pain caused by reduced blood flow to the heart muscle, often a symptom of coronary artery disease.

17 Hard

17 of 46

Remembering +4 | -1

Thickening of arteries due to cholesterol deposition is:

View answer and explanation

Correct option: A

Arteriosclerosis

Option A (Arteriosclerosis) is correct because it refers to the thickening and hardening of arteries due to cholesterol deposition.

18 Hard

18 of 46

Remembering +4 | -1

Foramen ovale is one of the shunts in foetus which connects

View answer and explanation

Correct option: B

Right and left atria

Option B (Right and left atria) is correct because the foramen ovale is a shunt present in the fetal heart that connects the right and left atria, allowing blood to bypass the fetal lungs.

19 Hard

19 of 46

Understanding +4 | -1

Statement-A : First heart sound is Lub.
Statement-B : Dub sound is produced due to closure of semilunar valves.

View answer and explanation

Correct option: D

Both statements are correct

Option D (Both statements are correct) is correct because the first heart sound (Lub) is produced by the closure of the tricuspid and bicuspid valves, and the second heart sound (Dub) is produced by the closure of the semilunar valves.

20 Hard

20 of 46

Remembering +4 | -1

In cardiac cycle maximum time is taken by

View answer and explanation

Correct option: B

Atria diastole

Option B (Atria diastole) is correct because the atria spend the longest portion of the cardiac cycle in diastole (relaxation and filling).

21 Hard

21 of 46

Remembering +4 | -1

Left systemic arch is absent in

View answer and explanation

Correct option: C

Birds only

Option C (Birds only) is correct because birds only have a right systemic arch, while mammals only have a left systemic arch.

22 Hard

22 of 46

Understanding +4 | -1

[A]: Perfluorocarbon can act as the substitute of blood.

[R]: Perfluorocarbon has some properties of blood.

View answer and explanation

Correct option: A

Both A and R are true and R is the correct explanation of A

Option A (Both A and R are true and R is the correct explanation of A) is correct because perfluorocarbons can act as blood substitutes due to their oxygen-carrying capacity and other blood-like properties.

23 Hard

23 of 46

Understanding +4 | -1

During joint diastole in cardiac cycle,

View answer and explanation

Correct option: B

Maximum filling of ventricles takes place

Option B (Maximum filling of ventricles takes place) is correct because during joint diastole, both atria and ventricles are relaxed, allowing for maximum ventricular filling.

24 Hard

24 of 46

Remembering +4 | -1

Arteries supplying blood to the heart are called:

View answer and explanation

Correct option: C

Coronary arteries

Option C (Coronary arteries) is correct because coronary arteries are the blood vessels that supply oxygenated blood to the heart muscle itself.

25 Hard

25 of 46

Understanding +4 | -1

Which of the following will result in decreased heart rate?

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Correct option: D

Parasympathetic nervous system

Option D (Parasympathetic nervous system) is correct because it releases acetylcholine, which slows down the heart rate.

26 Hard

26 of 46

Understanding +4 | -1

Read the following statements and select the most appropriate option.
(a) Nodal tissue present in the right upper corner of the right atrium is called AV node.
(b) The nodal musculature is autoexcitable.
(c) The AVN is responsible for initiating and maintaining the rhythmic contractile activity of the heart.

View answer and explanation

Correct option: D

Only statement (b) is true

Option D (Only statement (b) is true) is correct because the nodal musculature is indeed autoexcitable, while the AV node is not in the right upper corner and does not initiate the rhythmic contractile activity.

27 Hard

27 of 46

Remembering +4 | -1

Hirudin is:

View answer and explanation

Correct option: C

A protein produced from transgenic Brassica napus, which prevents blood clotting

Option C (A protein produced from transgenic Brassica napus, which prevents blood clotting) is correct because Hirudin is an anticoagulant protein that can be produced in transgenic Brassica napus (rapeseed) to prevent blood clotting.

28 Hard

28 of 46

Understanding +4 | -1

In which of the following pairs, the two items mean one and the same thing?

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Correct option: B

SA node - Pace maker

Option B (SA node - Pace maker) is correct because the SA node and the pacemaker are synonymous terms referring to the heart's natural electrical impulse generator.

29 Hard

29 of 46

Understanding +4 | -1

Select the incorrect statements

I. Barr body is another name for neutrophils

II. Agranulocytes are formed in the red bone marrow

III. Granulocytes are formed is the spleen and lymph node

IV. Lymphocytes exists as two major types, B and T lymphocytes

The correct option with incorrect statement is

View answer and explanation

Correct option: A

I, II and III

Option A (I, II and III) is correct because Barr bodies are inactivated X chromosomes in females, agranulocytes are formed in the red bone marrow, and granulocytes are formed in the red bone marrow, not the spleen and lymph nodes.

30 Hard

30 of 46

Remembering +4 | -1

Which of the following statements are incorrect
w.r.t Basophils?

A. Basophils are most abundant cells of the total
WBCs

B. Basophils secrete histamine, serotonin and
heparin

C. Basophils are involved in inflammatory response

D. Basophils have kidney shaped nucleus

E. Basophils are agranulocytes

Choose the correct answer from the options given below:

View answer and explanation

Correct option: C

A, D and E only

Option C (A, D and E only) is correct because basophils are the least abundant WBCs, have a lobed nucleus, and are granulocytes, not agranulocytes.

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 46 single-correct-answer MCQs on BODY FLUIDS AND CIRCULATION.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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