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Centralised Thermoregulation
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Centralised Thermoregulation

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Centralised Thermoregulation

There are other thermoregulatory responses that can take place in response to cold and hot.

Which of the following do you notice when you're cold?

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You can select multiple answers

Why do you think your body sweats?

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Temperature receptors in the skin send impulses to the thermoregulatory centre in the hypothalamus **** (in the brain). Impulses are then sent back to the skin to help lose heat if it's hot, or keep heat in if it's cold.

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Why do you think the capillaries in the skin are wider when it's hot?

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1

Warm conditions

When it's hot, the body needs to lose heat to the surroundings. This cools the body down to keep its temperature the relatively constant 37 °C. This is done in two ways:

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Vasodilation

Blood vessels that supply the capillaries in the skin will dilate (become wider). This transfers more heat energy by radiation from your body to the surroundings.

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Sweating

Sweat glands in your skin produce more sweat. The evaporation of sweat is a cooling action, transferring more heat to the environment.

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Which two methods of heat transfer are not involved when vasodilation helps to cool the body down?

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You can select multiple answers

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Cold conditions

When it's cold, the body needs to keep heat and not lose it to the surroundings. This warms the body to keep its temperature the relatively constant 37 °C. This is done in three ways:

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Vasoconstriction

The blood vessels that supply the capillaries in the skin will constrict (become narrower). This reduces heat loss to the surroundings by radiation.

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Less sweat

The body does not sweat as much. This means there is less sweat to evaporate, so less heat is lost to the surroundings.

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Shivering

The skeletal muscles relax and contract quickly and automatically, causing shivering. This needs lots of respiration (an exothermic process), which raises your body temperature.

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Which of the following does not happen when the body's temperature rises?

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