Biology B3 3.2 The human kidney.

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What may cause toxic (poisonous) substances may be produced in the body?
Chemical reactions.
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What do the kidneys do?
Excrete substances that the body does not want, they filter the blood, excreting substances you do not want and keeping those substances that the body needs.
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How do the kidneys excrete substances that the body does not want?
They first filter substances out of the blood and they then reabsorb the substances that the body needs.
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How is urea made?
Urea is made in the liver by the breakdown of amino acids.
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How is urea removed from the blood?
Urea is removed from the blood by the kidneys during filtration.
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How many kidneys does the body have?
Two.
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How does a healthy kidney produce urine?
First filtering the blood, reabsorbing all the sugar, reabsorbing dissolved ions needed by the body, reabsorbing dissolved ions needed by the body, reabsorbing as much water as the body needs and releasing urea, excess ions and water in the urine.
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Where is the urine temporarily stored before being removed from the body?
In the bladder.
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**LOOK UP AND LABEL DIAGRAM**
**LOOK UP AND LABEL DIAGRAM**
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Card 2

Front

What do the kidneys do?

Back

Excrete substances that the body does not want, they filter the blood, excreting substances you do not want and keeping those substances that the body needs.

Card 3

Front

How do the kidneys excrete substances that the body does not want?

Back

Preview of the front of card 3

Card 4

Front

How is urea made?

Back

Preview of the front of card 4

Card 5

Front

How is urea removed from the blood?

Back

Preview of the front of card 5
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