3 Almost all energy on this planet originates from: Explain the relationship between cellular metabolism and the production of heat in the human bodyAlmost all energy on this planet originates from:Where does it go from there?plants- animals (stored in “food”)Carbs, lipids, proteins metabolized stored as ATP via aerobic cellular respiration
4 Cont’d ATP = metabolic reactions, including: Muscle contraction and movement20% of E to movement80% lost as heat
5 Normal physiological range for CORE body temp Tc oFCore body temp – deep within the body
6 ThermoregulationFour mechanisms that move heat through the blood, to the skin, in order to transfer it to the environment:
7 Cont’d Conduction – solid on solid transfer Convection – air current transferRadiation – wave transfer (reradiatedEvaporation – evap cooling
8 Discuss the significance of humidity and wind in relation to body heat loss High humidity = lower heat lossLow humidity = higher heat lossWhy?High wind = higher heat lossLow wind = lower heat loss
9 The formation of sweat and the sweat response Sweat - the production of fluids secreted by the sweat glands in the skin of mammals.Two types of sweat glands can be found in humans: Eccrine glands and apocrine glands. The eccrine sweat glands are distributed over much of the body
11 Physiological and anatomical response to temp changes
12 Discuss the physiological responses to prolonged exercise in the heat Recall cardiac drift – as temperature increases, blood volume decreases due to sweating, venous return decreases…………..what happens to HR?Metabolically it causes increased muscle glycogen breakdown due to reduced blood flow to the muscles = anaerobic respiration = higher blood lactate levels
13 HOMEWORKOutline 3 health risks associated with exercising in the heat.What steps can be taken to prevent these conditions?What treatments are used to address these conditions if they occur?
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