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Homeostatis and the Control of Temperature

Homeostasis is the regulation of an organism's internal environment, particularly temperature. Warm-blooded animals can self-regulate their internal temperature, while cold-blooded animals cannot. Thermoregulation is controlled by thermoreceptors in the skin and hypothalamus, which detect temperature changes and send signals to the brain. The body’s optimal temperature is approximately 36.8°C. In cold conditions, the body shivers and blood vessels constrict; in heat, it sweats and blood vessels dilate. This process is governed by negative feedback mechanisms to maintain balance.

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Homeostatis and the Control of Temperature

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  1. Homeostatis and the Control of Temperature By Adam & Lucy

  2. What is it? • Homeostatis is the control of the internal environment • Animals that can control it themselves are called warm-blooded • Animals that cannot control it themsleves are called cold-blooded

  3. What is it controlled by? • Thermoreceptors in the skin • Thermoreceptors in the hypothalamus • In humans - thermoregulatory centre in hypothalamus

  4. How is it controlled? • Thermoreceptors in the skin and hypothalamus detect when the internal temperature is too high or low • They send messages to the brain • Effectors then correct the problem • Controlled by a negative feedback system

  5. Temperature in the Body • The body’s internal temperature should be about 36.8°C • When the external temperature lowers, the human body shivers and blood vessels contract • When the external temperature rises, the human body sweats and blood vessels dilate

  6. Example:

  7. Other information • A fever is when the body temperature rises • In cold situations, frostbite can sometimes occur because the organs have more priority for the blood than limbs, so the blood flow is restricted to some parts of the body; also, tissues are damaged by the harsh cold conditions

  8. Bibliography • “Homeostatis” March, 2006, online <www.biologymad.com/resources/A2%20Homeostasis.pdf>

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