Question

For the normal heartbeat, the depolarization stimulus originates in
A. His-bundle areas
B. Epicardium
C. Sinoatrial (SA)node
D. Atrioventricular (AV) node

Answer 1

Hint:
Depolarization stimulus is the stimulation of the nervous system that occurs after a traumatic event. The purpose of depolarization stimulus is to help the individual make cognitive and emotional adjustments to what has happened. Depolarization stimulus can help with things like decreasing the risk of PTSD, managing stress levels, and improving overall well-being.

Complete step by step answer:
For a normal heartbeat, depolarization stimulates the Sinoatrial (SA)node.
The SA node is a specialized cardiac muscle cell that contracts and pumps blood throughout the heart. It's located near the centre of the left ventricle, and its main role is to generate impulses that trigger other cells to contract. These impulses help pump blood through your circulatory system and keep everything working smoothly during regular breathing and heart pumping.
When you experience a depolarization shock, your SA node responds by contracting quickly and powerfully. This powerful contraction triggers other cells to contract too, which helps increase flow into your veins as well as improve overall heart function.

Option ‘C’ is correct

Note:
There are at least four different types of heartbeats, depending on how the electrical activity of the heart is organized. The normal heartbeat consists of two basic types of beats- Purkinje fibres contractions and myocardial cell depolarization (myocyte hypertrophy and activation). Depolarization stimulus for both these types of beats originates in a single node - the Sinoatrial (SA)node.