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The Cardiac Cycle.
Member rating: No Rating | Words: | Submitted: Thu Jan 08 2004
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The Cardiac Cycle that is the sequence of events that makes up one heartbeat. The heart beats approximately 70 times a minute and is constant it pumps around 75cm3 from each ventricle beat. The cardiac muscle contracts on its own without a nerve impulse this mean it is Myogenic. Contractions commence within the heart by the SAN Sino-atrial node (pacemaker) found in the right atrium. This tissue acts as a clock and contracts spontaneously and rhythmically once a second. When the cardiac muscle contracts the volume in the chamber decrease and the pressure in the chamber increases so the blood is pushed out. The periods of contraction are called Systole. The periods of relaxation are called Diastole. When surgically removed from the body, the heart will keep on beating for numerous hours provided it is supplied with the suitable nutrients and salts. This is possible because the heart possesses its...
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