Select Chapter Topics:
Q. No.
Assertion (A): SAN is called the pacemaker of the heart.
Reason (R): It generates the maximum number of action potentials and hence, it sets the pace of heart beat.
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. (A) is false, but (R) is true.
Subtopic: Â Rhythmic Excitation of Human Heart: Part 1 |
 95%
Level 1: 80%+
Hints
Assertion (A): Heart failure is sometimes called congestive heart failure.
Reason (R): Congestion of the lungs is one of the main symptoms of this disease.
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. (A) is false, but (R) is true.
Reason (R): Congestion of the lungs is one of the main symptoms of this disease.
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. (A) is false, but (R) is true.
Subtopic: Â DISORDERS OF CIRCULATORY SYSTEM |
 89%
Level 1: 80%+
Hints
Assertion (A): The heart rate of an individual can be determined by counting the number of QRS complexes.
Reason (R): The ECGs obtained from different healthy individuals have roughly the same shape for a given lead configuration.
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. (A) is false, but (R) is true.
Reason (R): The ECGs obtained from different healthy individuals have roughly the same shape for a given lead configuration.
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. (A) is false, but (R) is true.
Subtopic: Â ECG & Coronary Artery Disease |
 71%
Level 2: 60%+
Hints
Assertion (A): Cells need nutrients, O2, essential substances, and also the removal of harmful substances for healthy functioning.
Reason (R): It is essential to have efficient mechanisms for the movement of these substances to the cells and from the cells.
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. (A) is false, but (R) is true.
Reason (R): It is essential to have efficient mechanisms for the movement of these substances to the cells and from the cells.
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. (A) is false, but (R) is true.
Subtopic: Â Blood: General Description & RBC |
 54%
Level 3: 35%-60%
Hints
| Assertion (A): | Persons with AB blood group are called universal recipients. |
| Reason (R): | They can receive blood from the person with the O blood group. |
| 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. | (A) is False, but (R) is True. |
Subtopic: Â Blood: Blood Group (A,B,O) |
 80%
Level 1: 80%+
Hints
Assertion (A): Rh group should also be matched before transfusions.
Reason (R): An Rh-ve person, if exposed to Rh +ve blood, will form specific antibodies against the Rh antigens.
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. (A) is false, but (R) is true.
Reason (R): An Rh-ve person, if exposed to Rh +ve blood, will form specific antibodies against the Rh antigens.
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. (A) is false, but (R) is true.
Subtopic: Â Blood: Blood Group |
 89%
Level 1: 80%+
Hints
Assertion (A): SAN is called a pacemaker.
Reason (R): SAN is responsible for initiating and maintaining the rhythmic contractile activity of the heart.
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. (A) is false, but (R) is true.
Reason (R): SAN is responsible for initiating and maintaining the rhythmic contractile activity of the heart.
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. (A) is false, but (R) is true.
Subtopic: Â Rhythmic Excitation of Human Heart: Part 1 |
 94%
Level 1: 80%+
Hints
Unlock IMPORTANT QUESTION
This question was bookmarked by 5 NEET 2025 toppers during their NEETprep journey. Get Target Batch to see this question.
✨ Perfect for quick revision & accuracy boost
Buy Target Batch
Access all premium questions instantly
Assertion (A): Cardiac output can be defined as the volume of blood pumped out by the ventricles per minute.
Reason (R): The stroke volume multiplied by the heart rate (no. of beats per min.) gives the cardiac output.
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. (A) is false, but (R) is true.
Reason (R): The stroke volume multiplied by the heart rate (no. of beats per min.) gives the cardiac output.
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. (A) is false, but (R) is true.
Subtopic: Â Human Heart: Cardiac Cycle |
Level 3: 35%-60%
Hints
Assertion (A): SAN sets the pace of the activities of the heart.
Reason (R): SAN generates the maximum number of action potentials per minute.
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. (A) is false, but (R) is true.
Reason (R): SAN generates the maximum number of action potentials per minute.
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. (A) is false, but (R) is true.
Subtopic: Â Rhythmic Excitation of Human Heart: Part 1 |
 80%
Level 1: 80%+
Hints
Assertion (A): Human heart is myogenic.
Reason (R): Normal activities of the heart are regulated by the human brain.
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. (A) is false, but (R) is true.
Reason (R): Normal activities of the heart are regulated by the human brain.
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. (A) is false, but (R) is true.
Subtopic: Â Regulation of Cardiac Activity |
 73%
Level 2: 60%+
Hints
Select Chapter Topics:
© 2026 GoodEd Technologies Pvt. Ltd.