Key Points:
1) It is very important that the internal conditions of the body are kept within certain limits.
2) Water and ion content, as well as temperature and blood sugar level, are all carefully controlled.
Water is leaving our body all the time as we breathe out and sweat. We lose any excess water in the urine (produced by the kidneys). We also lose ions in our sweat and in the urine.
We must keep our temperature constant otherwise the enzymes in our body will not work properly (or not work at all).
Sugar in the blood is the energy source for cells. The level of sugar in our blood must be controlled.
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