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Pace maker is...

Pace maker is

A

Instrument for measuring heart beat

B

Instrument for measuring pulse rate

C

Auriculo-ventricular node that provides impulse for heart beat

D

Sinu-auricular node that provides impulse for heart beat

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Question**: The question asks for the definition or explanation of what a pacemaker is. 2. **Identifying the Context**: A pacemaker can refer to both a medical device and a natural part of the heart. In the context of biology, it often refers to the natural pacemaker of the heart. 3. **Natural Pacemaker**: The natural pacemaker of the heart is known as the Sinoatrial (SA) node. It is located in the upper right corner of the heart, specifically in the right atrium. 4. **Function of the SA Node**: The SA node generates electrical impulses that initiate the heartbeat. These impulses cause the heart muscles to contract and pump blood. 5. **Medical Pacemakers**: In addition to the natural pacemaker, there are also artificial pacemakers, which are devices implanted in the heart to regulate its rhythm when it is too slow or irregular. These devices send electrical signals to stimulate the heart to beat at a normal rate. 6. **Evaluating Options**: The options provided in the question include: - An instrument for measuring heartbeat (incorrect) - An instrument for measuring pulse rate (incorrect) - A node that provides impulse for heartbeat (incorrect) - Sino-auricular node that provides impulse for heartbeat (correct) 7. **Conclusion**: The correct answer is that the pacemaker refers to the Sinoatrial (SA) node, which is the natural pacemaker of the heart that provides the electrical impulses necessary for the heartbeat. ### Final Answer: The pacemaker is the Sinoatrial (SA) node, which provides electrical impulses for the heartbeat.
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