Changed to thrombin by prothrominase

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NEET • BIOLOGY • BODY FLUIDS AND CIRCULATION

Body fluids and circulation practice · Easy

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1 Easy

1 of 126

Understanding +4 | -1

In ABO blood grouping, person with blood group

{O^ - }

can accept blood from

View answer and explanation

Correct option: D

{O^ - }

Option D (

{O^ - }

) is correct because

{O^ - }

blood group lacks A, B, and Rh antigens, so it can only receive blood from other

{O^ - }

individuals.

2 Easy

2 of 126

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.

3 Easy

3 of 126

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.

4 Easy

4 of 126

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.

5 Easy

5 of 126

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.

6 Easy

6 of 126

Remembering +4 | -1

Name the artery which carries deoxygenated blood

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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.

7 Easy

7 of 126

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.

8 Easy

8 of 126

Application +4 | -1

What would be the cardiac output of a person if his heart rate is 110 beats/min and stroke volume is 90 ml?

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Correct option: C

9900 ml

Option C (9900 ml) is correct because cardiac output is calculated by multiplying heart rate by stroke volume: 110 beats/min * 90 ml/beat = 9900 ml/min.

9 Easy

9 of 126

Understanding +4 | -1

During ventricular systole
A. Blood gets filled in atria. B. AV valves remain close.
C. 70 ml blood is pumped by each ventricle.

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Correct option: D

All of these are correct

Option D (All of these are correct) is correct because during ventricular systole, blood fills the atria, the AV valves remain closed, and approximately 70 ml of blood is pumped by each ventricle.

10 Easy

10 of 126

Understanding +4 | -1

I. Atrioventricular valves
II. Semilunar valves
III. Right atrium
IV. Right ventricle
V. SAN
The correct pathway of RBC of from the option given below

View answer and explanation

Correct option: A

V→III→I→IV→II

Option A (V→III→I→IV→II) is correct because it represents the correct sequence of blood flow starting from the SAN, through the right atrium, tricuspid valve, right ventricle, and then the semilunar valves.

11 Easy

11 of 126

Analyzing +4 | -1

Study the following statements.
I.Plasma constitutes 45% of the human blood.
II.Albumin is a plasma protein, which helps in osmotic balance.
III.Factors responsible for the blood clotting process are present in the blood.
IV.Plasma without clotting factors is called serum.
IV.Minerals are not generally found in blood. Of the above statements.

View answer and explanation

Correct option: D

II, III and IV are correct and I and V are wrong

Option D (II, III and IV are correct and I and V are wrong) is correct because statements II, III, and IV are accurate descriptions of plasma proteins, blood clotting, and serum, while statements I and V contain incorrect information about plasma composition and mineral presence.

12 Easy

12 of 126

Remembering +4 | -1

ECG is a graphical representation of the electric activity of the heart during

View answer and explanation

Correct option: C

Cardiac cycle

Option C (Cardiac cycle) is correct because an ECG records the electrical activity of the heart throughout the entire cardiac cycle, including systole and diastole.

13 Easy

13 of 126

Understanding +4 | -1

Which system can decrease the heart rate and cardiac output.

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Correct option: C

Parasympathetic nervous system

Option C (Parasympathetic nervous system) is correct because the parasympathetic nervous system decreases heart rate and cardiac output through the vagus nerve.

14 Easy

14 of 126

Analyzing +4 | -1

Haemoglobin (Hb) transports oxygen from the lungs to tissues. The partial pressure of the oxygen in lungs is different from that tissues. Each Hb can bind to up to four oxygen molecules. Suppose, we have an equal number of Hb and oxygen molecules and all the oxygen molecules are in bounded form. Then, which of the following is true?

View answer and explanation

Correct option: C

Nearly one-fourth of all the Hb molecules are bound to four oxygen molecules each

Option C (Nearly one-fourth of all the Hb molecules are bound to four oxygen molecules each) is correct because if there are equal numbers of Hb and oxygen molecules, and each Hb can bind up to four oxygen molecules, then statistically, one-fourth of the Hb molecules will be fully saturated with four oxygen molecules.

15 Easy

15 of 126

Understanding +4 | -1

Which of the following sequences is truly a systemic circulation pathway?

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Correct option: D

Left auricle → Left ventricle → systemic aorta → Arteries → Tissues → Veins → Right atrium

Option D (Left auricle → Left ventricle → systemic aorta → Arteries → Tissues → Veins → Right atrium) is correct because it accurately describes the flow of blood in the systemic circulation.

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16 Easy

16 of 126

Understanding +4 | -1

Which of the following matches correctly

View answer and explanation

Correct option: C

Pulmonary artery - Carries deoxygenated blood to the lungs

Option C (Pulmonary artery - Carries deoxygenated blood to the lungs) is correct because the pulmonary artery is the only artery that carries deoxygenated blood.

17 Easy

17 of 126

Remembering +4 | -1

Human blood consists of

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because human blood consists of a fluid matrix (plasma) and formed elements (cells).

18 Easy

18 of 126

Understanding +4 | -1

Vaso Constriction causes

View answer and explanation

Correct option: C

increase in blood pleasure

Option C (increase in blood pleasure) is correct because vasoconstriction, the narrowing of blood vessels, increases resistance to blood flow, leading to a rise in blood pressure.

19 Easy

19 of 126

Understanding +4 | -1

Which of the following blood vessels in the circulatory system of frog has more 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 heart to the lungs in frogs.

20 Easy

20 of 126

Remembering +4 | -1

Which is largest among the given type of leucocytes?

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Correct option: C

Monocytes

Option C (Monocytes) is correct because monocytes are the largest type of leukocytes (white blood cells).

21 Easy

21 of 126

Understanding +4 | -1

Double circulation is

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Correct option: C

Passage of blood twice in heart through the separate way

Option C (Passage of blood twice in heart through the separate way) is correct because in double circulation, blood passes through the heart twice in separate circuits (pulmonary and systemic).

22 Easy

22 of 126

Understanding +4 | -1

In a blood transfusion case to avoid clumping of blood in a patient having blood group

A

, the donor blood group should be

View answer and explanation

Correct option: C

A

and

O

Option C (

A

and

O

) is correct because a person with blood group A has A antigens on their red blood cells and anti-B antibodies in their plasma. Therefore, they can receive blood from group A (which has A antigens) or group O (which has no A or B antigens).

23 Easy

23 of 126

Remembering +4 | -1

Which is correct for artery?

View answer and explanation

Correct option: A

Thick-walled in which blood flows at high pressure

Option A (Thick-walled in which blood flows at high pressure) is correct because arteries are designed to withstand and maintain high blood pressure due to their thick, elastic walls.

24 Easy

24 of 126

Remembering +4 | -1

Duration of a cardiac cycle is

View answer and explanation

Correct option: C

0.8 second

Option C (0.8 second) is correct because the duration of a complete cardiac cycle is approximately 0.8 seconds.

25 Easy

25 of 126

Remembering +4 | -1

Coronary heart disease is due to

View answer and explanation

Correct option: D

Insufficient blood supply to the heart muscles

Option D (Insufficient blood supply to the heart muscles) is correct because coronary heart disease results from reduced blood flow to the heart muscle.

26 Easy

26 of 126

Remembering +4 | -1

Which one indicates hypertension or high blood pressure (BP)

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Correct option: D

140/90

Option D (140/90) is correct because hypertension is defined as blood pressure consistently at or above 140/90 mmHg.

27 Easy

27 of 126

Remembering +4 | -1

Cardiac output is determined by

View answer and explanation

Correct option: D

Both (a) and (b)

Option D (Both (a) and (b)) is correct because cardiac output is the product of heart rate and stroke volume.

28 Easy

28 of 126

Remembering +4 | -1

The opening of auricles and ventricles on the right side is guarded by

View answer and explanation

Correct option: A

Tricuspid valve

Option A (Tricuspid valve) is correct because the tricuspid valve guards the opening between the right auricle (atrium) and the right ventricle.

29 Easy

29 of 126

Understanding +4 | -1

A patient comes to a doctor’s clinic situated on the 6th floor by walking up the staircase. As soon as he
reaches the clinic, the nurse records his blood pressure as 148/92 mm Hg. Which of these statements is surely
correct?

View answer and explanation

Correct option: C

The patient has high blood pressure but may or may not have hypertension

Option C (The patient has high blood pressure but may or may not have hypertension) is correct because a single high blood pressure reading does not necessarily indicate chronic hypertension.

30 Easy

30 of 126

Remembering +4 | -1

Universal blood recipient is

View answer and explanation

Correct option: B

Blood group-AB

Option B (Blood group-AB) is correct because individuals with blood type AB have both A and B antigens on their red blood cells and therefore do not produce anti-A or anti-B antibodies, allowing them to receive blood from any ABO blood type.

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 126 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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