PERSPIRATION: When the air temperature is above 37 C, heat is transferred from t

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PERSPIRATION: When the air temperature is above 37 C, heat is transferred from the air to the skin [12]. Heat warms the skin, stimulating cutaneous thermoreceptors to initiate the reflex arc that elicits sweating and cutaneous vasodilation, thus preventing significant body temperature elevation. However, sweating is initiated not only by a change in skin temperature, but also by an increase in mean body temperature. Even in a cold environment with low skin temperature, a hardworking person sweats profusely because metabolic heat production raises the central body temperature [13]. A person acclimatized to tropical weather can secrete as much as 4 kg of sweat an hour. You can use this to determine the maximum rate of heat transfer by evaporation (Heat of vaporization of water: 241 J/g). The body can accommodate a modest amount of activity in hot weather but strenuous activity would increase the metabolic rate above the body's ability to remove heat [12]. [12] Alan H. Cromer, PHYSICS FOR THE LIFE SCIENCES, 2nd ed. (New York: McGraw-Hill, 1977). [13] Roberto A. Frisancho, HUMAN ADAPTATION, (St. Louis: C.V. Mosby Co., 1979). More information on perspiraiton Compare the maximum rate of heat transfer to the basal metabolic rate by converting a BMR of 88 Kcal/hr into watts. What is the value? From this comparison you should see why the body can accommodate a modes amount of activity in hot weather but strenuous activity would increase the metabolic rate above the body's ability to remove heat [12].

Explanation / Answer

pls rate me first 88 Kcal/hr needs to be converted to watts, which is also J/sec (88 kcal) (1 hour) (1 min) (4184 J) hour 60 min 60 sec 1 kcal the hour's cancel out, the minutes cancel out, to leave seconds on the bottom the kcal will cancel out to leave joules on the top =102.27 Watts

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