00:01
So what is a circulation? circulation is a process by which the blood is directed to all parts of the body.
00:11
So the circulation is attained by the system called circulatory system or cardiovascular system.
00:19
So the main organ of the circulatory system is heart.
00:23
So how the heart circulates blood? heart circulates blood by a process called pumping.
00:29
The pumping of the blood is induced.
00:31
By a process called cardiac cycle.
00:37
So what is cardiac cycle? the event that helps in the coordinated movement of atrium and ventricle to pump blood to the body and receive blood to the heart is called as cardiac cycle.
00:50
The cardiac cycle is initiated by a impulse which guides the heart muscles to contract and relax based on a specific rhythm.
00:59
So the impulse of heart is by which organ or which initiates the heartbeat.
01:07
The heartbeat is initiated by the node that is present in the right atria.
01:13
It helps in the spontaneous firing.
01:17
So the spontaneous or non -interference of the spontaneous firing of the sinoatrial node leads to the heartbeat.
01:28
So the option b is the correct answer.
01:32
Spontaneous firing of cyno atrial node is the reason for heartbeat...