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Heart is myogenic , it can pump by itself without help of brain .

1. Arial diastole (relax)

- atrial muscle relax , pressure decrease, blood enter atrium

2. Atrail systole (contract)

- atrium pressure increase, blood enter venticle .

3. Ventricular systole

- blood enter ventricle , delay for 0.1s . ventricle pressure increase, semiluna valve open , blood flow into vessels .

4. Ventricular diastole

- ventricle mucle relax , prepare for next cardiac cycle .

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14y ago

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