B1 Topic 2 - Homeostasis

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  • Created by: laura_s
  • Created on: 09-01-16 15:50
What is meant by Homeostasis?
Maintaining a stable internal environment.
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What is Thermoregulation?
The control of body temperature.
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How does body temperature have an effect on enzymes?
Enzymes that help reactions to occur can work quicker, as a result of thermoregulation.
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What temperature do human bodies maintain and why?
37 degrees celsius. Chemical reactions that occur in the body work best at this temperature.
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What is the Hypothalamus?
The hypothalamus is a small part of the brain that receives information about the body's internal and external temperature.
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Give three examples of how the hypothalamus reacts when the body is too cold.
Erector muscle contracts, making hairs stand upright to trap air and warm it up. Sebaceous glands release oils at the base of hairs, keeping skin lubricated. Blood vessels at the surface of the skin narrow, so less heat escapes (Vasoconstriction).
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Give three examples of how the hypothalamus reacts when the body is too hot.
Erector muscle is relaxed so that hairs lie flat. The sweat gland releases sweat, which cools the skin when it evaporates. Blood vessels close to the surface dilate, allowing more blood to flow through and more heat to escape (Vasodilation).
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What is Osmoregulation?
The control of water in the body.
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How does the body react when it contains too much water?
Kidneys produce more urine.
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How does the body react when it contains too little water?
Kidneys produce little urine, and the brain responds to this by making you feel thirsty.
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What is blood glucose regulation?
The control of the concentration of glucose in the blood.
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What is negative feedback?
A control mechanism that reacts to a change in condition, by trying to bring the condition back to a normal level.
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Other cards in this set

Card 2

Front

What is Thermoregulation?

Back

The control of body temperature.

Card 3

Front

How does body temperature have an effect on enzymes?

Back

Preview of the front of card 3

Card 4

Front

What temperature do human bodies maintain and why?

Back

Preview of the front of card 4

Card 5

Front

What is the Hypothalamus?

Back

Preview of the front of card 5
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