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Q. No.The mammalian heart beat:
1.
Stops when the nerve supply to the heart is cut
2.
Originates at AV-node
3.
Decreases when stretch receptors in the vena cava are stimulated
4.
Slows down when the activity in the vagus nerve increases
Subtopic: Regulation of Cardiac Activity |
52%
Level 3: 35%-60%
Hints
If a molecule of CO2 released into the blood of a human foetus is exhaled through the mouth of the mother, it will not travel through the:
| 1. | Right atrium of mother |
| 2. | Right atrium of foetus |
| 3. | Left ventricle of mother |
| 4. | Left ventricle of foetus |
Subtopic: Human Heart: Double Circulation |
55%
Level 3: 35%-60%
Hints
If it was possible to genetically engineer humans to be able to run long distances faster at high altitudes, which of the following would not help?
| 1. | Increasing the thickness of cellular lining of the alveoli |
| 2. | Decreasing the average size of the alveoli |
| 3. | Increasing the amount of Hb in each RBC |
| 4. | More than one options as mentioned above |
Subtopic: Regulation of Cardiac Activity |
60%
Level 2: 60%+
Hints
| Assertion (A): | RBCs contain a red-colored complex protein called hemoglobin. |
| Reason (R): | RBCs are devoid of nucleus in most of the mammals and are biconcave in shape. |
| 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: Blood: General Description & RBC |
79%
Level 2: 60%+
Hints
| Assertion (A): | 'O' group individuals are called universal donors. |
| Reason (R): | Group 'O' blood can be donated to persons with any other 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: Blood: Blood Group (A,B,O) |
88%
Level 1: 80%+
Hints
| Assertion (A): | Nearly 20% of humans have Rh antigens. |
| Reason (R): | Rh antigen is named after Rhesus monkeys. |
| 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: Blood: Blood Group |
78%
Level 2: 60%+
Hints
| Assertion(A): | Birds and Mammals have double circulation. |
| Reason (R): | Two separate circulatory pathways are present in birds and mammals where the mixing of oxygenated and deoxygenated blood occurs. |
| 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: Human Heart: Double Circulation |
83%
Level 1: 80%+
Hints
| Assertion (A): | ECG is of great clinical significance. |
| Reason (R): | It helps to diagnose possible abnormalities/diseases 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: ECG & Coronary Artery Disease |
94%
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. |
Subtopic: Regulation of Cardiac Activity |
72%
Level 2: 60%+
Hints
| 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: Rhythmic Excitation of Human Heart: Part 1 |
95%
Level 1: 80%+
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