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GCSE Biology · key term
Charged particles, such as sodium ions, whose concentrations in body fluids affect the movement of water.
Used by AQA
Specification 4.5.3.3 · Paper 2
Revise: Excretion and the Formation of UreaMaintaining suitable concentrations of water and dissolved ions in body fluids therefore helps maintain suitable conditions inside every cell.
For each route, name the substances precisely: lungs—water; skin—water, ions and urea; kidneys—excess water, ions and urea.
Do not say that sweating regulates water balance. Sweat production helps control temperature; the resulting losses of water, ions and urea are not adjusted to maintain their levels.
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