Biology B3 3.5 Controlling body temperature.

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What temperature must the human body be kept?
About 37(degrees symbol)C.
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Why must the body temperature be kept stable at about 37(degrees symbol)C?
So that the enzymes work efficiently, enzymes work in a very narrow temperature range.
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What is the temperature deep inside the body, which must be kept stable, called?
The core body temperature.
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What is body temperature monitored and controlled by to keep it within the required narrow range?
The thermoregulatory centre in the brain.
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How does the thermoregulatory centre in the brain detect temperature?
This centre has receptors which detect the temperature of the blood flowing through the brain.
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What other organ detects temperature?
The skin.
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How does the skin detect temperature?
Temperature receptors in the skin send impulses to the brain to give information about skin temperature.
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Why does the skin look red when we are hot?
Due to increased blood flow.
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What else helps to cool the body down?
Sweating helps to cool the body down.
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Why is it important take in more water when it is hot?
When the body is hot it sweats and more water is lost from the skin therefore more water must be taken in with drinks and food to balance this loss.
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What detects blood temperature?
The thermoregulatory centre in the brain.
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What happens to the blood vessels if the core body temperature rises?
Blood vessels near the surface of the skin dilate allowing more blood to flow through the skin capillaries, energy is transferred by radiation and the skin cools.
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What happens to the sweat glands if the core body temperature rises?
Sweat glands produce more sweat, its water evaporates from the skin's surface, the energy required for the water to evaporate comes from the skin's surface, so we cool down.
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What happens to the blood vessels if the core body temperature falls?
Blood vessels near the surface of the skin constrict and less blood flows through the skin capillaries, less energy is radiated.
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Other cards in this set

Card 2

Front

Why must the body temperature be kept stable at about 37(degrees symbol)C?

Back

So that the enzymes work efficiently, enzymes work in a very narrow temperature range.

Card 3

Front

What is the temperature deep inside the body, which must be kept stable, called?

Back

Preview of the front of card 3

Card 4

Front

What is body temperature monitored and controlled by to keep it within the required narrow range?

Back

Preview of the front of card 4

Card 5

Front

How does the thermoregulatory centre in the brain detect temperature?

Back

Preview of the front of card 5
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