FSCN 1012 Lecture Notes - Lecture 1: Cool Air, Thermoregulation, Hyperthermia
31 Mar 2020
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Thermoregulation: the process that allows the human body to maintain its core internal temperature. Works to protect the body from heat gain or heat loss. Hyperthermia is an increase in body temperature by 5 degrees c or more. Core temperature rises quickly when heat gain exceeds heat loss. Temperature changes in blood around the hypothalamus directly stimulate this thermoregulatory control center. Thermal receptors in the skin provide input to regulate hypothalamic activity. Structures in the skin and tissue help to regulate temperature. Body temperature is warmer than the environment. Radiant heat energy leaves the body through air to solid cooler objects around us. Transfers heat directly through a liquid, solid or gas from one molecule to another. The circulation transports most of the body heat to the shell. A small amount continually moves by conduction directly through the deep tissues to the cooler surface. Warm air next to the skin acts as a zone of insulation.
