Topic 4.6.2 - Control of Water and Ion Content of the Body

Water leaves the body via the lungs when we breathe out and the skin when we sweat.
- Excess water is removed via the kidneys in the urine
Urea and ions are lost via the skin when we sweat
- Excess ions are removed via the kidneys in urine
In the liver:
- Excess amino acids are deanimated to form ammonia, which is converted into urea for excretion
- Poisonous substances are detoxified, and the breakdown products are excreted in the urine, via the kidneys
- Old blood cells are broken down and iron is stored
In a healthy kidney:
- The blood is filtered
- All the glucose is reabsorbed
- The dissolved ions needed by the body are reabsorbed
- As much water…

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