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How exercise affects heart rate Aim: My aim is to find out how exercise affects heart rate. Research: The heart is made almost entirely of muscle. It is a hollow organ which pumps blood around the body. The heart is enclose in a sack of tissue called the pericardium. The heart is thought to have evolved from a muscular region of an artery. It is divided up into four chambers: Two atria or auricles situated in the upper part of the heart, whose function is to receive blood. Two ventricles, situated in the lower part of the heart whose function is to pump blood. The right side of the heart receives deoxygenated blood through the Venae Cavae. The blood is then pumped to the lungs were it picks up a new oxygen supply. The left side of the heart receives oxygenated blood from the lungs and is pumped out around the body. The left...

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