Heatloss mechanismsresponse to heat

a. Heat loss by radiation and convection increases when the ambient temperature increases.

- The response is orchestrated by the posterior hypothalamus.

- Increases in temperature cause a decrease in sympathetic tone to cutaneous blood vessels, increasing blood flow through the arterioles and increasing arteriovenous shunting of blood to the venous plexus near the surface of the skin. Shunting of warm blood to the surface of the skin increases heat loss by radiation and convection.

b. Heat loss by evaporation depends on the activity of sweat glands, which are under sympathetic muscarinic control.

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