Take 5 chapter-wise practice tests plus 1 full module test on Body Fluids and Circulation for NEET with +4/-1 scoring, answer review, and concise explanations.
Attempt 5 focused chapter practice tests and 1 module test built from reframed NEET-style circulation questions from readable zoology module content.
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1. Blood is best described as a:
Explanation: Blood is a connective tissue with plasma as matrix and formed elements suspended in it.
2. The fluid matrix of blood is called:
Explanation: Plasma forms the liquid part of blood and contains water, proteins, ions, and many dissolved substances.
3. The major plasma proteins are:
Explanation: These proteins help in osmotic balance, immunity, and clotting.
4. The chief function of RBCs is transport of:
Explanation: RBCs transport oxygen and also take part in carbon dioxide transport.
5. The oxygen-carrying pigment in RBCs is:
Explanation: Haemoglobin in RBCs binds oxygen reversibly.
6. Mature mammalian RBCs are typically:
Explanation: This structure increases surface area and helps gas transport efficiency.
7. White blood cells are mainly involved in:
Explanation: WBCs protect the body against infection and foreign agents.
8. Platelets are important for:
Explanation: Platelets initiate haemostatic events and help prevent blood loss.
9. Granulocytes include:
Explanation: These WBCs possess cytoplasmic granules and distinct staining properties.
10. Antibody production is mainly associated with:
Explanation: B-lymphocytes and related immune cells are central to antibody-mediated immunity.
11. Monocytes are important because they can become:
Explanation: Monocytes transform into phagocytic macrophages in tissues.
12. Eosinophils are especially associated with:
Explanation: They increase in some allergies and helminth infections.
13. Basophils release substances like:
Explanation: Basophils participate in inflammatory responses.
14. The most abundant WBC in normal human blood is:
Explanation: Neutrophils are the most numerous leukocytes and active phagocytes.
15. Lymph differs from blood mainly because it:
Explanation: Lymph is a colorless fluid with lymphocytes but lacks RBCs under normal conditions.
16. Which is not a function of blood?
Explanation: Blood functions in transport, defence, regulation, and clotting, not plant reproduction.
17. A major role of lymph is to:
Explanation: Lymph collects tissue fluid and carries absorbed fats from intestinal lacteals.
18. A fall in haemoglobin level most directly reduces:
Explanation: Haemoglobin concentration determines blood oxygen transport capacity.
19. Which one is a formed element of blood?
Explanation: Formed elements are RBCs, WBCs, and platelets, not dissolved plasma components.
20. Which statement is correct?
Explanation: Serum is the fluid left after clotting, so many clotting proteins are removed.
21. The biconcave shape of RBCs is most useful because it:
Explanation: A biconcave disc improves diffusion efficiency and flexibility through capillaries.
22. Revision Booster 1. Recheck this Body Fluids and Circulation concept with a fresh option order. Blood is best described as a:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Blood is a connective tissue with plasma as matrix and formed elements suspended in it.
23. Revision Booster 2. Recheck this Body Fluids and Circulation concept with a fresh option order. The fluid matrix of blood is called:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Plasma forms the liquid part of blood and contains water, proteins, ions, and many dissolved substances.
24. Revision Booster 3. Recheck this Body Fluids and Circulation concept with a fresh option order. The major plasma proteins are:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. These proteins help in osmotic balance, immunity, and clotting.
25. Revision Booster 4. Recheck this Body Fluids and Circulation concept with a fresh option order. The chief function of RBCs is transport of:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. RBCs transport oxygen and also take part in carbon dioxide transport.
26. ABO blood grouping is based on the presence or absence of:
Explanation: A and B antigens on RBC membranes determine ABO groups.
27. A person with blood group A has antigen:
Explanation: Group A blood has A antigen on RBCs.
28. A person with blood group B has naturally occurring antibody against:
Explanation: Plasma of group B contains anti-A antibodies.
29. An individual with blood group AB is often called universal recipient in ABO system because:
Explanation: Without those antibodies, they can receive all ABO blood types in simplified matching.
30. In the ABO system, a person with blood group O has:
Explanation: Group O RBCs lack A and B antigens.
31. An Rh-positive person possesses:
Explanation: Rh-positive blood has D antigen on RBC surface.
32. Erythroblastosis foetalis is associated with incompatibility involving:
Explanation: It typically arises when an Rh-negative mother carries an Rh-positive foetus and antibodies develop.
33. Why is cross-matching important before blood transfusion?
Explanation: Incorrect antigen-antibody interaction can cause dangerous transfusion reactions.
34. The process that prevents excessive blood loss after injury is called:
Explanation: Haemostasis includes vessel spasm, platelet plug formation, and clotting.
35. Fibrin is formed from:
Explanation: Fibrinogen is converted into insoluble fibrin during clot formation.
36. Prothrombin is converted into thrombin with the help of:
Explanation: This is a standard step in the clotting sequence.
37. Platelets help clotting mainly by:
Explanation: Platelets adhere at injury sites and release factors that promote coagulation.
38. Heparin acts mainly as:
Explanation: Heparin prevents unnecessary clot formation inside vessels.
39. Blood group O is often called universal donor in ABO terms because RBCs of this group:
Explanation: Their RBCs are least likely to react with anti-A or anti-B antibodies in simplified ABO matching.
40. If an Rh-negative mother carries an Rh-positive foetus for the first time, severe effect is often absent in first pregnancy mainly because:
Explanation: Sensitization usually occurs after exposure during or near the first delivery.
41. Serum differs from plasma because serum lacks:
Explanation: After clotting, fibrinogen is used up, leaving serum.
42. The insoluble mesh that traps blood cells during clot formation is:
Explanation: Fibrin threads stabilize the clot.
43. Deficiency or improper function of clotting factors can lead to:
Explanation: The coagulation cascade depends on properly functioning clotting factors.
44. A person with blood group AB has plasma antibodies:
Explanation: This is why AB is considered universal recipient in the simplified ABO sense.
45. Which statement is correct?
Explanation: Blood group reactions are driven by RBC surface antigens and plasma antibodies.
46. A person with blood group O has anti-A and anti-B antibodies because their RBCs:
Explanation: ABO antibodies correspond to antigens absent from the person's own RBCs.
47. Revision Booster 1. Recheck this Body Fluids and Circulation concept with a fresh option order. ABO blood grouping is based on the presence or absence of:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. A and B antigens on RBC membranes determine ABO groups.
48. Revision Booster 2. Recheck this Body Fluids and Circulation concept with a fresh option order. A person with blood group A has antigen:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Group A blood has A antigen on RBCs.
49. Revision Booster 3. Recheck this Body Fluids and Circulation concept with a fresh option order. A person with blood group B has naturally occurring antibody against:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Plasma of group B contains anti-A antibodies.
50. Revision Booster 4. Recheck this Body Fluids and Circulation concept with a fresh option order. An individual with blood group AB is often called universal recipient in ABO system because:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Without those antibodies, they can receive all ABO blood types in simplified matching.
51. The human heart has:
Explanation: Human heart consists of two atria and two ventricles.
52. The human heart is located in the:
Explanation: It lies in the mediastinum between the two lungs.
53. The membrane enclosing the heart is called:
Explanation: The heart is enclosed within a double-walled pericardial sac.
54. The largest and thickest chamber wall is found in the:
Explanation: It pumps blood into systemic circulation and therefore has the thickest wall.
55. The valve between left atrium and left ventricle is:
Explanation: The left atrioventricular valve is bicuspid or mitral.
56. The right atrioventricular valve is:
Explanation: This valve lies between the right atrium and right ventricle.
57. Deoxygenated blood from the body enters the right atrium through:
Explanation: These major veins return systemic venous blood to the heart.
58. Pulmonary veins carry:
Explanation: Pulmonary veins are exceptions among veins because they carry oxygenated blood.
59. Pulmonary artery carries:
Explanation: It is an exception among arteries because it carries deoxygenated blood.
60. The septum separating the two ventricles is called:
Explanation: This septum prevents mixing of ventricular blood.
61. The natural pacemaker of the human heart is:
Explanation: The sinoatrial node initiates the heartbeat.
62. Impulse from SA node reaches ventricles after passing through:
Explanation: The atrioventricular node relays impulses toward ventricular conduction pathways.
63. Chordae tendineae are attached to:
Explanation: They prevent valve flaps from inverting during ventricular contraction.
64. The arteries supplying the heart muscle itself are:
Explanation: Myocardium receives blood through coronary circulation.
65. Closure of AV valves produces:
Explanation: The 'lub' sound is associated with closure of tricuspid and bicuspid valves.
66. Closure of semilunar valves produces:
Explanation: The 'dub' sound follows closure of aortic and pulmonary semilunar valves.
67. The left ventricle has thicker musculature than right ventricle because it pumps blood to:
Explanation: Systemic circulation requires much greater pressure than pulmonary circulation.
68. Mixing of oxygenated and deoxygenated blood is prevented in human heart mainly by:
Explanation: The four-chambered heart supports complete separation of the two blood streams.
69. Blood enters systemic circulation from:
Explanation: The aorta carries oxygenated blood from left ventricle to the body.
70. Which statement is correct?
Explanation: Pulmonary veins and pulmonary artery are classic circulation exceptions.
71. Atrioventricular valves prevent:
Explanation: AV valves close during ventricular contraction to maintain one-way blood flow.
72. Revision Booster 1. Recheck this Body Fluids and Circulation concept with a fresh option order. The human heart has:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Human heart consists of two atria and two ventricles.
73. Revision Booster 2. Recheck this Body Fluids and Circulation concept with a fresh option order. The human heart is located in the:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. It lies in the mediastinum between the two lungs.
74. Revision Booster 3. Recheck this Body Fluids and Circulation concept with a fresh option order. The membrane enclosing the heart is called:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. The heart is enclosed within a double-walled pericardial sac.
75. Revision Booster 4. Recheck this Body Fluids and Circulation concept with a fresh option order. The largest and thickest chamber wall is found in the:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. It pumps blood into systemic circulation and therefore has the thickest wall.
76. The complete sequence of atrial and ventricular events in one heartbeat is called:
Explanation: It includes atrial systole, ventricular systole, and joint diastole.
77. During atrial systole, blood is pushed from:
Explanation: Atrial contraction completes ventricular filling.
78. During ventricular systole, semilunar valves are:
Explanation: When ventricular pressure exceeds arterial pressure, semilunar valves open.
79. The relaxation phase of the heart chambers is called:
Explanation: Diastole allows chamber filling.
80. Pulse is commonly measured in arteries because it reflects:
Explanation: Each ventricular systole sends a pressure wave through arteries.
81. The pressure recorded during ventricular contraction is:
Explanation: Systolic pressure is the higher blood pressure value.
82. Normal resting blood pressure is approximately:
Explanation: This is the standard textbook normal resting value.
83. An electrocardiogram records the:
Explanation: ECG is a graphic record of cardiac electrical events.
84. The P wave of ECG represents:
Explanation: P wave reflects spread of impulse across atria.
85. QRS complex mainly represents:
Explanation: The large QRS complex reflects rapid depolarisation of ventricles.
86. The T wave mainly indicates:
Explanation: The T wave is associated with recovery of ventricular muscle after contraction.
87. Cardiac output is equal to:
Explanation: It is the volume pumped by each ventricle per minute.
88. The amount of blood pumped by each ventricle per beat is:
Explanation: Stroke volume is the blood ejected in one ventricular contraction.
89. The first heart sound is produced at the beginning of:
Explanation: AV valves close when ventricles begin to contract.
90. If both atria and ventricles are in relaxation together, the phase is:
Explanation: This is the common filling period when all chambers are relaxed.
91. Backflow from arteries into ventricles is prevented by:
Explanation: Aortic and pulmonary semilunar valves close after ventricular ejection.
92. Blood pressure is commonly measured using a:
Explanation: It is the standard instrument for arterial blood pressure measurement.
93. If SA node fails, heartbeat may continue but usually at a slower rate because:
Explanation: Secondary pacemaker regions can generate impulses, though usually more slowly.
94. Pulse pressure is the difference between:
Explanation: It reflects the pressure change in arteries with each beat.
95. Which sequence is correct?
Explanation: This is the standard order of major ECG events in one heartbeat.
96. The QRS complex in an ECG is most directly associated with:
Explanation: QRS marks electrical activation of ventricles, leading to ventricular systole.
97. Revision Booster 1. Recheck this Body Fluids and Circulation concept with a fresh option order. The complete sequence of atrial and ventricular events in one heartbeat is called:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. It includes atrial systole, ventricular systole, and joint diastole.
98. Revision Booster 2. Recheck this Body Fluids and Circulation concept with a fresh option order. During atrial systole, blood is pushed from:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Atrial contraction completes ventricular filling.
99. Revision Booster 3. Recheck this Body Fluids and Circulation concept with a fresh option order. During ventricular systole, semilunar valves are:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. When ventricular pressure exceeds arterial pressure, semilunar valves open.
100. Revision Booster 4. Recheck this Body Fluids and Circulation concept with a fresh option order. The relaxation phase of the heart chambers is called:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Diastole allows chamber filling.
101. In humans, blood passes through the heart twice in one complete circuit, a phenomenon called:
Explanation: Mammals and birds show complete double circulation.
102. Pulmonary circulation refers to movement of blood between:
Explanation: This circuit oxygenates blood in lungs.
103. Systemic circulation refers to movement of blood between:
Explanation: Systemic circulation delivers oxygenated blood to tissues and returns deoxygenated blood.
104. The advantage of complete double circulation is that it:
Explanation: This improves oxygen delivery efficiency in mammals.
105. Persistently high arterial blood pressure is called:
Explanation: Hypertension means sustained elevation of blood pressure above normal.
106. Reduction of blood flow through coronary arteries primarily affects:
Explanation: Coronary artery disease compromises oxygen supply to myocardium.
107. Angina pectoris is typically experienced as:
Explanation: It reflects temporary inadequate blood supply to myocardium.
108. Heart failure means the heart:
Explanation: Heart failure is reduced pumping efficiency, not necessarily instant cardiac arrest.
109. A portal system is special because blood passes through:
Explanation: The hepatic portal system is a classic example.
110. A sudden blockage of a coronary artery may lead to:
Explanation: Interruption of coronary blood flow can cause myocardial infarction.
111. Humans have complete double circulation because the heart is:
Explanation: Complete septation allows separate pulmonary and systemic circuits.
112. Untreated hypertension increases risk of damage especially to:
Explanation: High pressure stresses vessels and target organs.
113. Veins return blood toward the:
Explanation: By definition veins carry blood toward the heart.
114. Arteries carry blood:
Explanation: Direction relative to the heart defines arteries and veins.
115. Exchange of gases, nutrients, and wastes between blood and tissues occurs mainly in:
Explanation: Their thin walls allow efficient exchange.
116. Which pair is correctly matched?
Explanation: The other descriptions are inaccurate.
117. In pulmonary circulation, blood leaving the right ventricle reaches the lungs through the:
Explanation: Pulmonary artery carries deoxygenated blood from heart to lungs.
118. Oxygenated blood from lungs returns to heart through:
Explanation: These veins open into the left atrium.
119. Which statement is correct?
Explanation: Pulmonary vessels are exceptions to the oxygenation rule, so direction is the defining criterion.
120. The best combination for rapid revision of this chapter is:
Explanation: NEET questions from this chapter are spread across all of these linked areas.
121. Why is complete double circulation advantageous in humans?
Explanation: Separated pulmonary and systemic circuits improve oxygen delivery to active tissues.
122. Revision Booster 1. Recheck this Body Fluids and Circulation concept with a fresh option order. In humans, blood passes through the heart twice in one complete circuit, a phenomenon called:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Mammals and birds show complete double circulation.
123. Revision Booster 2. Recheck this Body Fluids and Circulation concept with a fresh option order. Pulmonary circulation refers to movement of blood between:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. This circuit oxygenates blood in lungs.
124. Revision Booster 3. Recheck this Body Fluids and Circulation concept with a fresh option order. Systemic circulation refers to movement of blood between:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. Systemic circulation delivers oxygenated blood to tissues and returns deoxygenated blood.
125. Revision Booster 4. Recheck this Body Fluids and Circulation concept with a fresh option order. The advantage of complete double circulation is that it:
Explanation: Quick recall: this booster targets the same NEET concept in a new drill slot so the idea sticks under timed conditions. This improves oxygen delivery efficiency in mammals.