Question

why SA nodes is called pacemaker of heart????

Answer 1

It controls the heart rate by generating electrical impulses and then sending electrical signals through the heartmuscle, causing the heart to contract and pump blood throughout the body.The heart beat originates fromS.A. node and spreads to the walls of auricles which contract.

Answer 2

1.The sino-atrial (SA) node is a specialised bundle of neurons located in the upper part of the right atrium of the heart. The cardiac impulse originating from the SA node triggers a sequence of electrical events in the heart, thereby controlling the sequence of muscle contraction that pumps blood out of the heart. Since the SA node initiates and maintains the rhythmicity of the heart, it is known as the natural pacemaker of the human body............i hope it will help u................