Thermoregulation
- Created by: kpritchard16
- Created on: 20-12-18 21:03
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- Thermoregulation
- What changes core temperaure
- menstrual cycle
- increase in oestradiol circulating during follicular phase causes decrease in basal body temp
- Increase in progesterone found in luteal phase causes increase in basal body temp
- meals, ambient temperature, exercise
- menstrual cycle
- Heat transfer mechanisms
- Convection: movement of air currently, thermal gradients
- Conduction: direct transfer of heat from one substance to another substance its touching
- Evaporation: change of substance from liquid to gas
- Radiation: energy that is radiated or transmitted in form of rays/waves or particles
- Process of maintaining an internal temperature within tolerable range
- Warm receptors
- Sensitive to temperatures above 25oC, unresponsive to temperature above 45oC
- Cold receptors
- Sensitive to temperatures between 10oC - 20oC and temperatures above 45oC
- Mostly A delta fibres, afferent and thinly myelinated, some C fibres
- Central thermoreceptor
- located in the hypothalamus, sense the temperature of blood flowing through them, most are warm sensing, very sensitive
- Heat gain
- Behavioural mechanisms
- decreased exposed SA, shelter, seek external heat source, voluntary exercise
- Physiological mechanisms
- Shivering, shunting of periphery blood vessels, piloerection, non-shivering thermogenesis, increase in metabolic rate
- Behavioural mechanisms
- Heat loss
- Physiological mechanisms
- decreased metabolic rate(hard), decreased SNS, peripheral vasodilation, decrease in BP
- Behavioural mechanisms
- Increased exposed SA, remove clothing, seek out cooler area, seek out air movement
- Physiological mechanisms
- What changes core temperaure
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