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NEET • BIOLOGY • BODY FLUIDS AND CIRCULATION

Body fluids and circulation practice · Mixed difficulty

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Showing 61-90 of 335 questions

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61 Easy

61 of 335

Understanding +4 | -1

Vaso Constriction causes

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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.

62 Medium

62 of 335

Understanding +4 | -1

A circulatory system, which is formed by capillaries and ends with capillaries is

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Correct option: D

Hypophysial portal system

Option D (Hypophysial portal system) is correct because a portal system starts and ends with capillaries, and the hypophysial portal system connects the hypothalamus to the anterior pituitary gland.

63 Medium

63 of 335

Remembering +4 | -1

The largest WBC is the

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Correct option: C

Monocyte

Option C (Monocyte) is correct because monocytes are the largest type of white blood cell (WBC).

64 Medium

64 of 335

Analyzing +4 | -1

Which of the following terms doesn’t mean one and the same?

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Correct option: D

Myocardial infarction – Myocardial ischaemia.

Option D (Myocardial infarction – Myocardial ischaemia) is correct because myocardial infarction is the death of heart tissue due to lack of blood supply, while myocardial ischemia is simply the reduction of blood supply.

65 Medium

65 of 335

Application +4 | -1

A person with only anti-A antibodies in his plasma can donate blood to people with blood group(s)

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Correct option: D

Only AB and B

Option B (Only O and B) is correct because a person with only anti-A antibodies can donate to those without A antigens, which are blood groups O and B.

66 Medium

66 of 335

Remembering +4 | -1

Spiral valve is present in

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Correct option: D

Truncus arteriosus

Option D (Truncus arteriosus) is correct because the spiral valve is located within the truncus arteriosus in some lower vertebrates, helping to direct blood flow.

67 Medium

67 of 335

Understanding +4 | -1

Cardiac out-put not be increased by:-

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Correct option: D

Parasympathetic signals

Option D (Parasympathetic signals) is correct because parasympathetic signals decrease heart rate and contractility, thus reducing cardiac output.

68 Easy

68 of 335

Understanding +4 | -1

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

69 Easy

69 of 335

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).

70 Medium

70 of 335

Understanding +4 | -1

Which of the statement is correct?
I. The closing and opening of the heart is through the valves during each heart beat
II. The movement of the impulse passes from the SA node to all the regions of the heart wall
III. The number of the times the heart beats in one minute is 60
IV. Change in the blood volume in all the chambers of the heart occurs during the cardiac cycle
The option with correct statements is

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Correct option: B

II, III and IV

Option B (II, III and IV) is correct because the closing and opening of the heart is through the valves during each heartbeat, the impulse moves from the SA node, the heart beats 60 times in a minute, and blood volume changes during the cardiac cycle.

71 Hard

71 of 335

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.

72 Easy

72 of 335

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).

73 Medium

73 of 335

Understanding +4 | -1

If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect?

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Correct option: D

The flow of blood into the pulmonary artery will be reduced

Option D (The flow of blood into the pulmonary artery will be reduced) is correct because the tricuspid valve prevents backflow into the right atrium, and its malfunction would reduce blood flow to the pulmonary artery.

74 Hard

74 of 335

Understanding +4 | -1

Which of the following is mismatched?

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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.

75 Easy

75 of 335

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).

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76 Hard

76 of 335

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.

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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.

77 Easy

77 of 335

Remembering +4 | -1

Which is correct for artery?

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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.

78 Easy

78 of 335

Remembering +4 | -1

Duration of a cardiac cycle is

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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.

79 Medium

79 of 335

Remembering +4 | -1

Which wave of human heart out of PQRST is used for determining the heart beat of an individual?

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Correct option: B

QRS

Option B (QRS) is correct because the QRS complex represents ventricular depolarization, which is a key event in determining heart rate and rhythm.

80 Easy

80 of 335

Remembering +4 | -1

Coronary heart disease is due to

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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.

81 Hard

81 of 335

Remembering +4 | -1

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

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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.

82 Easy

82 of 335

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.

83 Medium

83 of 335

Understanding +4 | -1

The end of the T-wave marks the end of

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Correct option: B

End of systole

Option B (End of systole) is correct because the T-wave in an ECG represents ventricular repolarization, which marks the end of ventricular contraction (systole).

84 Medium

84 of 335

Understanding +4 | -1

Sequence of electrical impulse in heart beat is

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Correct option: C

Pacemaker → atria → AV node → ventricle

Option C (Pacemaker → atria → AV node → ventricle) is correct because it represents the correct sequence of electrical impulse conduction in the heart.

85 Medium

85 of 335

Analyzing +4 | -1

Consider the following statements
I. Sympathetic nerve input to skeletal muscle causes the blood vessels in the muscle to dilate
II. Blood flow can be regulated by autonomic nerve signals emanating from of the brain.
III. Carotid artery, Chemosensors detect low

O_2

levels in the blood and promote increased blood pressure.
IV. Hormones such as angiotensin and vasopressin cause venules to constrict.
The correct statements include

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Correct option: C

II, III, IV

Option C (II, III, IV) is correct because statements II, III, and IV are accurate regarding circulation control.

86 Easy

86 of 335

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.

87 Medium

87 of 335

Analyzing +4 | -1

Select the incorrect statements
I. Barr body is an 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

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Correct option: C

Only III

Option C (Only III) is correct because granulocytes are formed in the bone marrow, not the spleen and lymph nodes.

88 Hard

88 of 335

Remembering +4 | -1

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

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Correct option: B

Quaternary

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

89 Medium

89 of 335

Understanding +4 | -1

Which one of the following is correct for atherosclerosis?

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Correct option: D

All of these

Option D (All of these) is correct because atherosclerosis involves constriction of the arterial lumen, high cholesterol levels, and cholesterol deposition in the arteries.

90 Medium

90 of 335

Remembering +4 | -1

The function of coronary artery is to supply blood to the

View answer and explanation

Correct option: C

Heart

Option C (Heart) is correct because the coronary artery supplies oxygenated blood to the heart muscle itself.

Revision notes and key takeaways

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

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Body fluids and circulation practice · Mixed difficulty

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