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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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