KINE 2490 Chapter Notes - Chapter 25: Relative Humidity, Cardiac Output, Hyperthermia
22 Dec 2015
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Thermoregulation: process of body maintaining body temperature; controlled by hypothalamus. Hyperthermia: elevated body temperature; occurs when internal heat production exceeds external heat loss. Heat regulating mechanisms (sweating/shivering) activated by: stimulation of peripheral thermal receptors in skin, changes is blood temp as it flows thru hypothalamus. Increased blood flow to muscles& skin by cardiac output& redistributing regional blood flow. During exercise, vessels dilate to divert warm blood to skin to surface. Loss of heat from a warmer object to cooler object in form of infrared waves. Direct transfer of heat thru liquid, solid or gas from warmer to cooler object. Depends on conduction from skin to water/air next to it; effectiveness depends on speed at which the air next to body is exchanged. Most effective heat loss mechanism for cooling body. Sweat= weak saline solution; sweating does not cool the body, but evaporation of.
