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Circulatory System (blood flow through mammalian heart and body (r.…
Circulatory System
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rhythm of heart beats
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pacemaker cells in the sinoatrial node of the heart are autorhythmic (repeatedly contract and relax without nervous system signal
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electrical impulses reach atrioventricular node which delays electrical impulse for about 0.1 second
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structure of arteries, capillaries and veins
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cardiac cycle
- Atrial systole and ventricular diastole
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- Ventricular systole and atrial diastole
During the remainder of cycle, ventricular contraction pumps blood into large arteries through semilunar valves
- Atrial and ventricular diastole
During relaxation phase, blood returning from large veins flows into atria and then into ventricles through AV valves
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