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Factors that affect heart rate and blood pressure
Member rating: No Rating | Words: | Submitted: Thu Jan 13 2005
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Title: Factors that affect heart rate and blood pressure Blood pumped through blood vessels is always under pressure. This pressure is highest in the arteries closest to the heart and gradually decreases as the blood travels around the body. Blood keeps moving around the body because there are differences in pressure in the blood vessels. Blood flows from higher-pressure areas to lower-pressure areas until it eventually returns to the heart. Blood pressure is controlled by three things: heart rate, stroke volume and peripheral resistance. Generally, when heart rate increases, blood pressure rises, and vice versa. A number of things affect heart rate, such as body's temperature, nervous system, hormones, medications, and diseases, etc. The amount of blood pumped out of a ventricle with each heartbeat is called stroke volume. When you're resting, stroke volume is about the same as the amount of blood that veins carry back to the heart....
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