The pacemaker, which initiates and maintains the heartbeat, is located in the wall of which one of the following chambers of heart ?

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Q: 29 (IES/2007)
The ‘pacemaker’, which initiates and maintains the heartbeat, is located in the wall of which one of the following chambers of heart ?

question_subject: 

Science

question_exam: 

IES

stats: 

0,14,10,2,14,8,0

keywords: 

{'right ventricle': [0, 0, 2, 1], 'left ventricle': [0, 0, 8, 0], 'pacemaker': [1, 0, 0, 0], 'heartbeat': [0, 0, 2, 0], 'chambers': [2, 0, 3, 1], 'left atricle': [0, 0, 1, 0], 'heart': [1, 0, 0, 0], 'right atricle': [0, 0, 1, 0], 'wall': [1, 0, 2, 3]}

The pacemaker, also known as the sinoatrial (SA) node, is responsible for initiating and regulating the heartbeat. It is located in the wall of the right atrium of the heart.

The options provided are the different chambers of the heart. Let`s examine each option to understand why the correct answer is option 2:

1. Left atrium: The left atrium is one of the four chambers of the heart, but it does not house the pacemaker. It receives oxygenated blood from the lungs and pumps it to the left ventricle.

2. Right atrium: The right atrium is another chamber of the heart, and it is the correct location for the pacemaker. The SA node is located in the wall of the right atrium and generates electrical signals that initiate the heartbeat.

3. Left ventricle: The left ventricle is the largest and strongest chamber of the heart. It receives oxygenated blood from the left atrium and pumps it to the rest of the body. However, it is not the location of the pacemaker.

4. Right ventricle: The right ventricle is the chamber that receives deoxygenated blood from the right atrium and pumps it to the lungs for oxygenation