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SCAN0050 - Metabolic Rate I Basal metabolic rate(BMR(idling...

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Unformatted text preview: Metabolic Rate I Basal metabolic rate (BMR)(idling) I Reflects the energy the body needs to perform its most essential activities I Total metabolic rate (T MR)(doin’stuff) I Total rate of kilocalorie consumption to fuel all ongoing activities awe: em: mwarmu. r-a mum warm mum Regulation of Body Temperature I Body temperature — balance between heat production and heat loss I At rest, the liver, heart, brain, and endocrine organs account for most heat production I During vigorous exercise, heat production from skeletal muscles can increase 30—40 times I Normal body temperature is 36.2°C (98.2°F); optimal enzyme activity occurs at this temperature I Temperature spikes above this range denature proteins and depress neurons mam; tum E'nmu mm a, rm. 95-11:“; a harm: emu“. Core and Shell Temperature I Organs in the core (within the skull, thoracic, and abdominal cavities) have the highest temperature I The shell, essentially the skin, has the lowest temperature I Blood serves as the major agent of heat transfer between the core and shell I Core temperature remains relatively constant, while shell temperature fluctuates substantially (20°C—40°C) «mm. we Vain Hum/1.1. are Now ; lhrmm mama that Influence BMR I Surface area, age, gender, stress, and hormones I As the ratio of surface area to volume increases, BMR increases I Males have a disproportionately high BMR I Stress increases BMR I Thyroxine increases oxygen consumption, cellular respiration, and BMR Regulation of Body Temperature eplirlnet awf- nu MB on m Mechanisms of Heat Exchange l I The body uses four mechanisms of heat exchange I Radiation — loss of heat in the form of infrared rays I Conduction — transfer of heat by direct contact I Convection — transfer of heat to the surrounding air I Evaporation — heat loss due to the evaporation of water from the lungs, mouth mucosa, and skin (insensible heat loss I Evaporative heat loss becomes sensible when body templelijture rises and sweating produces increased water for vapo ' ation 9mm“ :m mum-fmmt r». mama, “mm mew 7/7/2010 ...
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