Question

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(d) The structure responsible for starting electrical impulses that cause the heart to contract
and relax in order to keep pumping blood.
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Answer 1

Answer:

SA node (sinoatrial node) – known as the heart's natural pacemaker. The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node. The electrical activity spreads through the walls of the atria and causes them to contract. This forces blood into the ventricles.

Explanation:

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Answer 2

Answer:

PACEMAKER( SAN Sino Atrial Node)

Explanation:

By the best of my knowledge the structure which is responsible for starting impulses inside heart for contraction and relaxation is "Sino Atrial Node (SAN) "

It's generally located at the side and the base of 'Superior Vena Cava' in the 'Right Atrium' ..

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