HEART ACTIVITY: BLOOD AND TEMPERATURE
Most of us know that the body temperature is maintained near 98.6 degrees Fahrenheit. This temperature is held rather constantly by the body because all systems are geared to function best at this temperature level. When we are exposed to heat or cold, our body attempts to adjust itself to these circumstances and to maintain an internal temperature as near to normal as possible. We are familiar with the process of shivering when we are chilled. Shivering results from a rapid contraction of muscles in various parts of the body. This muscular contraction produces heat which warms the blood and helps maintain a constant body temperature. When we are hot, on the other hand, the body compensates by perspiring and radiating heat from the skin surface. The blood flow to the skin increases, carrying body heat to the surface blood vessels from which it can be radiated. The process of perspiration requires the production of water, which surfaces to the skin, and by the process of evaporation allows the body to lose heat. This slightly salty water is produced by sweat glands through the basic operation of increased blood flow to these organs. Therefore, a person who is exposed to a hot or a cold environment has increased heart work.*13/309/5*
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