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I'm assuming you mean the heart. they are the chamber that contracts pumps the blood.
arteries
it contracts
It contracts to push blood throughout the body.
it just happens OK?
Heart pumps out blood into major vessels(aorta,pulmonary arteries)
left ventricle
There is no such thing as a fiber chamber of the heart.
Diastolic and systolic is when your heart contracts and relaxes.
the valve would fail to close or would invert when the heart contracts, this may cause heart failure.
The heart doesnt produce any fluid, blood is produced in bone marrow. The heart only pumps the blood through the veins and arteries, all in a continuous loop. Honestly you have to be pretty stupid to not understand this, unless your four years old
Mitral valve insufficiency is a term used when the valve between the upper left chamber of the heart (atrium) and the lower left chamber (ventricle) does not close well enough to prevent back flow of blood when the ventricle contracts.