'Bundle of His' is a part of which one of the following organs in humans?
1. Heart
2. Kidney
3. Pancreas
4. Brain
| 1. | SA Node | 2. | AV Node |
| 3. | Bundle of Hiss | 4. | Purkinje Fibres |
| 1. | Acts as the pacemaker of the heart. |
| 2. | Is responsible for the contraction of ventricles. |
| 3. | Regulates the blood flow through the heart. |
| 4. | Is the site where the heartbeat is generated. |
| 1. | SA node → Bundle of His → AV node |
| 2. | AV node → SA node → Purkinje fibres |
| 3. | Purkinje fibres → Bundle of His → SA node |
| 4. | SA node → AV node → Bundle of His → Purkinje fibres |
| 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. |
| 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. |
In which one of the following pairs the two items mean one and the same thing?
1. Malleus - anvil
2. SA node - pacemaker
3. Leucocytes - lymphocytes
4. Haemophilia - blood cancer
Tricuspid Valves are present between
| 1. | left atria and aorta |
| 2. | right atria and right ventricle |
| 3. | left atria and left ventricle |
| 4. | both (1) and (2) |