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Photosynthesis xerophytes Plan Thermoregulation Blood glucose Blood water potential O2 and CO2 Levels Blood urea The maintenance of a constant internal environment requires control systems that detect stimuli and make the necessary adjustments to return the environment to normal. They do this is by homeostasis. One example of homeostasis is thermoregulation. Heat can be lost and gained by radiation, conduction and convection. Evaporation also plays an important part in heat loss by using heat from the body to evaporate water, and therefore cooling the body down. Heat is also lost in substances leaving the body, such as exhaled air, urine and faeces. Heat can also gained through metabolic activities inside the body cells, such as respiration. In mammals, body temperature is controlled by the hypothalamus, which acts like a thermostat. Sensory cells called thermoreceptors detect changes in body temperature. The central thermoreceptors in the hypothalamus measure the temperature of the blood passing through the hypothalamus. This is known...

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