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Investigating the effect which exercise has on the pulse rate Introduction: The heart main job is to transport oxygen around the body. The cardiac cycle is the sequence of events during one complete cycle of a heartbeat. This consists of the simultaneous contraction of the two atria, a short pause, then the simultaneous contraction of the two ventricles, followed by a longer pause while the entire heart relaxes. The whole cycle is repeated about 70- 80 times per minute under resting conditions. When the atria contacts, the blood in them enters the two relaxing ventricles, completely filling them. The mitral and tricuspid valves, which were open, now begin to shut, and as they do so, they create vibrations in the heart walls and tendons, causing the first heart sound. The ventricles on contraction push open the pulmonary and aortic valves and eject blood in to he respective vesicles. The closed mitral...

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