The Human Heart Rate
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Title: The Human Heart Rate

Essay Details:

Subject: Science
Author: Joni H
Date: September 26, 2013
Level: University
Grade:
Length: 3 / 813

Essay text:

With an increase in body movement there is an increase in the cell's energy use and the heart rate must increase to pump enough blood to the cells. Then, as body movement decreases again, so does the heart rate. The heart muscle can be enlarged with regular vigorous exercise. A larger heart is more efficient than a smaller heart as it is stronger and can hold more blood. The heart is a cardiac muscle and contracts by itself, even when removed from the body. The muscles rhythmic beat is sped up or slowed down by the autonomic nerves that are attached to the heart. The heartbeat has two phases. Systole is the name given to the contraction phase and diastole is the name given to the relaxation phase...

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