Pacemaker is the correct answer
<span>The electrical stimulus in the heart begins in the APEX OF THE ATRIA at the SINOATRIAL NODE. The heart has its own electrical conduction system that enables it to work as a unit and supply oxygenated blood throughout the body. This system needs to work in a sequential manner so that the delivery of unoxygenated blood to the lungs will not backflow to other parts of the heart and the body. </span>
Answer:
True
Explanation:
dukher prodip Kumar Sharma gai hai na yar
The stomach lining replaces mucus itself every few days