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9 March, 18:22

Pacemakers maintain the heartbeat in people who suffer from certain defects. The function of an artificial pacemaker is to send electrical impulses that will contract the heart muscles and regulate the pumping of the heart. Which condition could be corrected by a pacemaker?

A. The individual's sinoatrial node ceases to function.

B. The individual's central nervous system fails to signal the heart to contract and relax.

C. The individual's arteries are blocked.

D. The valves in the individual's heart cease to function.

+2
Answers (2)
  1. 9 March, 19:11
    0
    Answer: Option A

    Explanation: Pacemakers are artificial device used generates electrical signals in the heart. It is used when the heart is not able to contract and relax (pumping of blood) naturally. This is known as natural pacing of the heart.

    This mechanism is controlled naturally by the sinoatrial node of the heart. When the muscles present in the heart relax and contract the pumping of blood takes place.

    When this mechanism is not properly working, artificial devices called as pacemakers are used.
  2. 9 March, 20:34
    0
    I believe it would be A. because that is the muscle that regulates the heart pumping. This would happen because the pacemaker is taking over and it now has no purpose.
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