Hairs on skin: Nerve impulese from the hypothalmus go to the erector muscles, attached to the hairs, the muscle contract, and so hairs rise trapping a layer of insulating air. Less heat lost via radiation.
Decrease in sweating: less heat loss via evapouration of sweat from the skin.
Behavioural response: incraesed into movement to generate heat in muscles; move into sunlight.
DECREASE IN HEAT GAIN/ INCREASE IN HEAT LOSS.
Vasodilation: hypothalamus sends nerve impules to the muscles of the surafce arteriolies, causing them to dilate, dirverting blood to the surface cappillaries, more heat lost via radiation.
Hairs on the skin: Nerve impulses from the hypothalmus to the erector pili muscles are inhibited. The muscles relax, causing hairs to lie flat and provide little insulation, therefore causing more heat lost via radi.
Sweating: Increase in sweating, Hypothalmus, send nerve impuleses to sweat gland, causes the release of sweat. The water in sweat evapourates. Latent heat of vaporisation. Panting:increases evaporation of water from lungs and tongue. Behavioural responses: animals: mud bathing, shade seeking.
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