Which of the following describes the function of basophils most accurately?
1. Phagocytosis of bacteria
2. Secretion of heparin and histamine during inflammatory reactions
3. Destruction of parasites and involvement in allergic reactions
4. Transport of gases like oxygen and carbon dioxide

Subtopic:  Blood: White Blood Cells |
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Level 1: 80%+
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Match the following types of circulation with their characteristics:
 
Type of Circulation Characteristics
A. Pulmonary Circulation 1. Carries oxygenated blood from the heart to tissues
B. Systemic Circulation 2. Carries deoxygenated blood to the lungs for oxygenation
C. Hepatic Portal System 3. Direct blood flow from digestive organs to liver
D. Coronary Circulation 4. Supplies blood to the cardiac muscles
1. A-1, B-2, C-3, D-4
2. A-2, B-1, C-3, D-4
3. A-1, B-3, C-2, D-4
4. A-2, B-4, C-1, D-3
Subtopic:  Human Heart: Double Circulation |
 85%
Level 1: 80%+
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How do parasympathetic neural signals affect heart function?
1. Increase heart rate and cardiac output.
2. Decrease heart rate and cardiac output.
3. Increase action potential conduction speed.
4. Increase the strength of ventricular contraction.
Subtopic:  Regulation of Cardiac Activity |
 87%
Level 1: 80%+
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What blood vessel is indicated by the arrow in the given figure?

1. Aorta
2. Pulmonary trunk
3. Superior vena cava
4. Coronary sinus
Subtopic:  Human Heart: Gross Anatomy |
 84%
Level 1: 80%+
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Which layer of blood vessels is comparatively thin in veins but thick in arteries?
1. Tunica externa
2. Tunica media
3. Tunica intima
4. Endothelium
Subtopic:  Human Heart: Double Circulation |
 84%
Level 1: 80%+
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The main advantage of a closed circulatory system, as seen in annelids and chordates, is:
1. Blood is circulated more quickly, more precisely and at higher pressure to the organs.
2. Blood directly bathes the tissues, facilitating faster diffusion of gases.
3. Nutrients and waste are exchanged more efficiently in open spaces.
4. The heart does not require chambers for efficient circulation.
Subtopic:  Circulatory Pathways |
 89%
Level 1: 80%+
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Consider the given two statements:
Statement I: Fishes possess a two-chambered heart with an atrium and a ventricle, where deoxygenated blood is pumped to the gills for oxygenation.
Statement II: Birds and mammals possess a four-chambered heart, which ensures complete separation of oxygenated and deoxygenated blood.
Options:
1. Both Statement I and Statement II are correct.
2. Statement I is correct but Statement II is incorrect.
3. Statement I is incorrect but Statement II is correct.
4. Both Statement I and Statement II are incorrect.
Subtopic:  Circulatory Pathways |
 91%
Level 1: 80%+
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Consider the given two statements:
Assertion (A): The sino-atrial node (SAN) is also known as the pacemaker of the heart.
Reason (R): The SAN can generate action potentials at the highest frequency and initiate the heartbeat.
Options:
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Human Heart: Gross Anatomy |
 93%
Level 1: 80%+
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Heart failure is different from cardiac arrest because:
1. Heart failure refers to the heart’s inability to pump sufficient blood, while cardiac arrest is when the heart stops beating entirely.
2. Heart failure only affects the ventricles, whereas cardiac arrest affects the atria.
3. Heart failure is reversible, while cardiac arrest is not.
4. Cardiac arrest is caused by hypertension, while heart failure is caused by valve malfunction.
Subtopic:   DISORDERS OF CIRCULATORY SYSTEM |
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Level 1: 80%+
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Which of the following rows is correct?
Oxygenated Blood  Deoxygenated Blood
1. Left atrium  Left ventricle  Right atrium  Right ventricle 
2. Left atrium  Right atrium Left ventricle  Right ventricle 
3. Left atrium Right ventricle  Right atrium  Right ventricle 
4. Right atrium  Right ventricle  Left atrium  Left ventricle 
5. Left ventricle Right atrium Left atrium Right ventricle
Subtopic:  Human Heart: Double Circulation |
 88%
Level 1: 80%+
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