Biology B3 3.1 Controlling internal conditions.

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What must be removed from the cells?
Waste products.
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In the body, what must be kept constant (carefully controlled)?
Internal conditions.
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What is keeping the body's internal conditions within a narrow range called?
Homeostasis.
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What internal conditions in the body must be controlled?
Temperature, blood glucose, water and ion content and levels of waste products must all be controlled.
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Waste products have to ve removed from the body, what do these include?
Carbon dioxide: produced by respiration removed via the lungs when we breathe out, and urea: produced in the liver from the breakdown of amino acids removed by the kidneys in the urine and temporarily stored in the bladder.
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Why is the control of water and ions in the body important?
Water and ions enter the body when we eat and drink. If the water or ion content in the body is wrong, too much waterway move into or out of the cells and this could damage or destroy cells.
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Where is urea made?
In the liver from the breakdown of amino acids.
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Card 2

Front

In the body, what must be kept constant (carefully controlled)?

Back

Internal conditions.

Card 3

Front

What is keeping the body's internal conditions within a narrow range called?

Back

Preview of the front of card 3

Card 4

Front

What internal conditions in the body must be controlled?

Back

Preview of the front of card 4

Card 5

Front

Waste products have to ve removed from the body, what do these include?

Back

Preview of the front of card 5
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