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NEET • BIOLOGY • BODY FLUIDS AND CIRCULATION
Body fluids and circulation practice · Mixed difficulty
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31
Easy
31 of 335
Application
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What would be the cardiac output of a person if his heart rate is 110 beats/min and stroke volume is 90 ml?
View answer and explanation
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.
32
Medium
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Understanding
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The blood pumped by the …A… ventricle enters the …B… artery, whereas the …C… ventricle pumps blood into the …D…
Choose the correct option for A, B, C and D
Choose the correct option for A, B, C and D
View answer and explanation
Correct option: A
A-right, B-pulmonary, C-left, D-aorta
Option A (A-right, B-pulmonary, C-left, D-aorta) is correct because the right ventricle pumps blood into the pulmonary artery, and the left ventricle pumps blood into the aorta.
33
Medium
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Application
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If the heart rate of an individual is 60 beats and the stroke volume is , the cardiac output will be
View answer and explanation
Correct option: B
Option B () is correct because cardiac output is calculated by multiplying heart rate by stroke volume: 60 beats/min * 60 mL/beat = 3600 mL/min.
34
Medium
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Remembering
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The branches of the nodal tissue, which give rise to minute fibres throughout the ventricular musculature of the respective sides are called
View answer and explanation
Correct option: C
Purkinje fibre
Option C (Purkinje fibre) is correct because Purkinje fibers are the terminal branches of the nodal tissue that spread throughout the ventricular musculature, facilitating rapid and coordinated ventricular contraction.
35
Medium
35 of 335
Analyzing
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Choose the odd one w.r.t. group of animals possessing four-chambered heart.
View answer and explanation
Correct option: A
Crocodilus, Psittacula, Bangarus
Option A (Crocodilus, Psittacula, Bangarus) is correct because Bangarus (krait) is a reptile with a three-chambered heart, while Crocodilus (crocodile) and Psittacula (parrot) have four-chambered hearts. Thus, it is the odd one out within the group.
36
Medium
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Remembering
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The largest artery in the body is
View answer and explanation
Correct option: A
Aorta
Option A (Aorta) is correct because the aorta is the largest artery in the body, responsible for carrying oxygenated blood from the heart to the systemic circulation.
37
Medium
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Understanding
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Blood pressure in the pulmonary artery is:
View answer and explanation
Correct option: C
More than that in the pulmonary vein
Option C (More than that in the pulmonary vein) is correct because the pulmonary artery carries deoxygenated blood away from the heart to the lungs, requiring higher pressure than the pulmonary vein which returns oxygenated blood to the heart.
38
Easy
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Understanding
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During ventricular systole
A. Blood gets filled in atria. B. AV valves remain close.
C. 70 ml blood is pumped by each ventricle.
A. Blood gets filled in atria. B. AV valves remain close.
C. 70 ml blood is pumped by each ventricle.
View answer and explanation
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.
39
Easy
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Understanding
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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
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.
40
Medium
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Analyzing
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Assertion: In amphibians and reptiles, double
circulation is incomplete.
Reason: Unlike in birds and mammals, in
amphibian and reptiles, the left atrium receives
oxygenated blood and right atrium receives
deoxygenated blood.
circulation is incomplete.
Reason: Unlike in birds and mammals, in
amphibian and reptiles, the left atrium receives
oxygenated blood and right atrium receives
deoxygenated blood.
View answer and explanation
Correct option: C
If Assertion is true but Reason is false
Option C (If Assertion is true but Reason is false) is correct because while the assertion about incomplete double circulation in amphibians and reptiles is true, the reason incorrectly describes the flow of oxygenated and deoxygenated blood into the atria.
41
Medium
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Understanding
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Erythroblastosis foetalis is a disease in which
View answer and explanation
Correct option: D
Foetus have severe anaemia and jaundice
Option D (Foetus have severe anaemia and jaundice) is correct because erythroblastosis foetalis is a hemolytic disease in the fetus caused by maternal antibodies against fetal red blood cells.
42
Easy
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Analyzing
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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.
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.
43
Medium
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Remembering
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Which of the following cations is required for the conversion of prothrombin into active thrombin by thromboplastin?
View answer and explanation
Correct option: D
Option D () is correct because calcium ions () are essential for several steps in the coagulation cascade, including the conversion of prothrombin to thrombin.
44
Medium
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Remembering
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Which of the following play an important role in blood clotting
View answer and explanation
Correct option: A
Calcium ions
Option A (Calcium ions) is correct because calcium ions play a crucial role in the blood clotting cascade.
45
Easy
45 of 335
Remembering
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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.
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46
Easy
46 of 335
Understanding
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Which system can decrease the heart rate and cardiac output.
View answer and explanation
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.
47
Medium
47 of 335
Remembering
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The number of valves that guard the opening at the origin of caroticosystemic aorta is
View answer and explanation
Correct option: B
Three
Option B (Three) is correct because the aortic valve, guarding the origin of the aorta, has three cusps or leaflets.
48
Easy
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Analyzing
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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.
49
Easy
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Understanding
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Which of the following sequences is truly a systemic circulation pathway?
View answer and explanation
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.
50
Hard
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Understanding
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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 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
(i) A healthy adult man has on an average 5 million to 5.5 million of 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.
51
Medium
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Remembering
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Lymph differs from blood in
View answer and explanation
Correct option: A
Absence of RBC
Option A (Absence of RBC) is correct because lymph does not contain red blood cells, unlike blood.
52
Hard
52 of 335
Understanding
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[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.
[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.
53
Medium
53 of 335
Understanding
+4 | -1
What happens when the pacemaker is non-functional?
View answer and explanation
Correct option: B
The cardiac muscles do not contract in a coordinated manner rhythmically
Option B (The cardiac muscles do not contract in a coordinated manner rhythmically) is correct because the pacemaker (SA node) is responsible for initiating and coordinating heart muscle contractions.
54
Medium
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Remembering
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The deposition of lipids on the wall lining, the lumen of large and medium-sized arteries is referred to as
View answer and explanation
Correct option: D
Atherosclerosis
Option D (Atherosclerosis) is correct because it refers to the deposition of lipids on the wall lining the lumen of large and medium-sized arteries.
55
Easy
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Understanding
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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.
56
Medium
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Analyzing
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Choose the incorrect pair
A) Fibrinogen – Coagulation
B) Globulins – Osmotic balance
C) Monocytes – Phagocytic
D) Neutrophils – Heparin
E) Basophils – Histamine
Choose incorrect options.
A) Fibrinogen – Coagulation
B) Globulins – Osmotic balance
C) Monocytes – Phagocytic
D) Neutrophils – Heparin
E) Basophils – Histamine
Choose incorrect options.
View answer and explanation
Correct option: C
B and D
Option C (B and D) is correct because Globulins are primarily involved in immunity, not osmotic balance, and Neutrophils are phagocytic cells, not involved in Heparin production.
57
Hard
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Remembering
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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.
58
Easy
58 of 335
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).
59
Medium
59 of 335
Remembering
+4 | -1
How many number of action potentials are generated by SAN
View answer and explanation
Correct option: B
70-75 / min
Option B (70-75 / min) is correct because the SAN (sinoatrial node) generates action potentials at a rate of 70-75 per minute, which sets the heart rate.
60
Hard
60 of 335
Understanding
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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
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.
Revision notes and key takeaways
Review BODY FLUIDS AND CIRCULATION in your textbook or class notes, then use this set to check your understanding.
Showing 31-60 of 335 questions
