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Diastole and systole are two phases of the cardiac cycle. They occur as the heart beats, pumping blood through a system of blood vessels that carry blood to every part of the body. Systole occurs when the heart contracts to pump blood out, and diastole occurs when the heart relaxes after contraction.
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Explanation:
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1 ) SYSTOLE
* the contraction of the heart is called SYSTOLE
2) DIASTOLE
*the relaxation of the heart is called DIASTOLE
*one SYSTOLE followed by a DIASTOLE makes a complete heart beat
The sounds of the heart are called LUB-DUB
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