cardiac cycle
The heart rhythmatically send blood around the body
The sequence take place in one heart beat is called cardiac cycle.
each cycle last 0.8 seconds when the person at rest
the cardiac cycle has three stage
atrial systole
ventricle systole
Diastole atria and ventricle relax
Electrical impulse spread from SA node to atria
https://youtu.be/JEIF5o7Axbg?si=tnj6xnH143LOudN8
The atria pump the blood to ventricle through av valves and bicuspid valve
The ventricle are relax states and the semilunar valves are close
in ventricular systole the atria relax mean while the electrical impulse generated from SA node
reach the ventricle cause them to contract
when ventricle contract the semilunar valve force to open
the blood pump from ventricle to aorta and pulmonary artery
at the same time av valve and mitral valve are close
the closing of valve produces the first heart sound lub
in diastole both atria and ventricle relax the semilunar valve are close
to prevent back flow of blood into the ventricle the valve closing produce sound dub
blood start flow into the ventricle the cycle is repeated.
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