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Describe how the heartbeat is intiated and how the contraction of the 4 chambers are co-ordinated
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Describe how the heartbeat is initiated, and how the contraction of the 4 chambers are co-ordinated. During the lifetime of the heart it undergoes a series of events. This is known as the cardiac cycle. This is then split into two major components, one of them is systole (contraction) and the other one is diastole (relaxation). Diastole is when the blood returns atria of the heart through the pulmonary vein and the vena cava. As soon as the atria fills up with blood, the pressure within them causes the atrioventricular valves to open this then allows the blood to pass into the ventricles. This is the stage when the cardiac muscle both of the atria and ventricles are relaxed, this relaxation of the ventricles cardiac muscles reduces the pressure in the ventricles. This then means the pressure within them is less than that of the aorta and the pulmonary artery, so...
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