Q: 107 (SSC/NA)
question_subject:
Science
question_exam:
SSC
stats:
0,10,2,1,1,10,0
keywords:
{'pacemaker': [1, 0, 0, 0], 'urine formation': [1, 0, 0, 0], 'functions': [0, 0, 0, 1], 'heart beat': [4, 0, 0, 1], 'respiration': [2, 0, 1, 3], 'digestion': [3, 0, 1, 3]}
The correct answer is option 3: Initiation of heart beat. The pacemaker, also known as the sinoatrial (SA) node, is responsible for initiating the electrical signals that regulate the heartbeat. It is a specialized group of cells located in the right atrium of the heart. The SA node generates electrical impulses that spread throughout the heart, causing the heart muscles to contract and pump blood. This process is essential for maintaining a regular heart rate and ensuring the efficient circulation of blood throughout the body. Options 1 and 2 are incorrect as the pacemaker is not involved in the regulation of urine formation or digestion. Option 4 is also incorrect as the pacemaker does not play a role in initiating respiration.