Question

Heart beat is controlled by a natural pacemaker called SA node.

• A. True
• B. False

Answer 1

The correct option is A True

Heartbeat can be defined as the rhythmic contraction and relaxation of the heart. SA node is also called a sinoatrial node responsible for generating electrical impulses.

The walls of the auricles receive an electrical signal from the SA node, which causes them to contract. The contraction of auricles forces the blood to move into the ventricles. In this way, the SA node maintains the rhythm and rate of the heart.

The given statement is true.