Homeostasis and Negative feedback

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Biology

GCSE Biology

WJEC

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11 Terms

1
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What is homeostasis?

Keeping internal environment constant

2
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What must remain constant?

  • Glucose levels

  • Body temperature

  • Water content

3
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What must be removed?

Waste Chemicals

4
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What are hormones?

  • Chemical messengers controlled by bodily functions

  • Proteins produced by glands and carried by blood

5
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Negative Feedback - 1

Normal glucose levels

6
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Negative Feedback - 2

Carbohydrate meal is eaten

7
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Negative Feedback - 3

Glucose level in blood goes up

8
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Negative Feedback - 4

Pancreas starts releasing insulin in blood

9
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Negative Feedback - 5

Liver turns glucose into insoluble glycogen and stores it

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Negative Feedback - 6

Glucose in blood decreases back to normal

11
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Negative Feedback - 7

Pancreas stops releasing insulin