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hypothalamus

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Hypothalamus
◦ The hypothalamus functions as a body thermostat, by receiving
information from various parts of the body
◦ The hypothalamus is able to respond to changes in blood
temperature as small as 0.01oC (Sherwood, 1996)
◦ The thermoregulation center receives input from the
thermoreceptors in the hypothalamus which function to maintain
temperature when blood passes through the brain and receptors
on the skin which maintain external temperatures
◦ In the hypothalamus there are two centers of temperature regulation, namely:
(Sherwood, 2011)
1. Posterior region: which is activated by cold temperatures and then triggers reflexes
which mediate heat production and heat convection.
2. Anterior region: which is activated by warmth, triggers reflexes which mediate heat
reduction
Sensors in the thermoregulation system are the hypothalamus and skin receptors
(peripheral receptors). While effectors are sweat glands, and skin capillaries.
This sector has three mechanisms involved in thermoregulation, namely:
1. quantitative changes in behavior are more effective mechanisms
2. vasomotor response characterized by vascular vasoconstriction and piloerection in
response to cold, and vasodilation and sweating in response to heat
3. shivering and even increase - average metabolism
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