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Human Thermoregulation

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Presentation on theme: "Human Thermoregulation"— Presentation transcript:

1 Human Thermoregulation
Using a negative feedback loop

2 Homeostasis: maintaining a relatively constant internal environment
pH glucose levels salt levels temperature

3 Control of body temperature
Control of body temperature

4 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Control of body temperature

5 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Control of body temperature

6 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Thermostat in brain activates cooling mechanisms Control of body temperature

7 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Control of body temperature

8 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Blood vessels in skin dilate and heat escapes Control of body temperature

9 Homeostasis: Internal body temperature of approximately 36–38C
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Temperature decreases Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Blood vessels in skin dilate and heat escapes

10 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Temperature decreases Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Blood vessels in skin dilate and heat escapes Thermostat shuts off cooling mechanisms Control of body temperature

11 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Temperature falls below normal Temperature decreases Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Blood vessels in skin dilate and heat escapes Thermostat shuts off cooling mechanisms Control of body temperature

12 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Temperature falls below normal Temperature decreases Thermostat in brain activates warming mechanisms Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Blood vessels in skin dilate and heat escapes Thermostat shuts off cooling mechanisms Control of body temperature

13 Homeostasis: Internal body temperature of approximately 36–38C
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Temperature falls below normal Temperature decreases Blood vessels in skin constrict, minimizing heat loss Thermostat in brain activates warming mechanisms Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Blood vessels in skin dilate and heat escapes Thermostat shuts off cooling mechanisms

14 Homeostasis: Internal body temperature of approximately 36–38C
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Temperature falls below normal Temperature decreases Blood vessels in skin constrict, minimizing heat loss Thermostat in brain activates warming mechanisms Skeletal muscles rapidly contract, causing shivering, which generates heat Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Blood vessels in skin dilate and heat escapes Thermostat shuts off cooling mechanisms

15 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Temperature falls below normal Temperature decreases Temperature increases Blood vessels in skin constrict, minimizing heat loss Thermostat in brain activates warming mechanisms Skeletal muscles rapidly contract, causing shivering, which generates heat Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Blood vessels in skin dilate and heat escapes Thermostat shuts off cooling mechanisms Control of body temperature

16 Control of body temperature
Homeostasis: Internal body temperature of approximately 36–38C Temperature rises above normal Temperature falls below normal Temperature decreases Temperature increases Thermostat shuts off warming mechanisms Blood vessels in skin constrict, minimizing heat loss Thermostat in brain activates warming mechanisms Skeletal muscles rapidly contract, causing shivering, which generates heat Thermostat in brain activates cooling mechanisms Sweat glands secrete sweat that evaporates, cooling body Blood vessels in skin dilate and heat escapes Thermostat shuts off cooling mechanisms Control of body temperature

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