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n. a mineral element and an important constituent of the human body. It is the main base ion of intracellular fluid. Together with sodium, it helps to maintain the electrical potential of the nervous system and is thus essential for the functioning of nerve and muscle. Normal blood levels are between 3.5 and 5 mmols/litre. High concentrations occur particularly in kidney failure and may lead to arrhythmia and finally to cardiac arrest. Low values result from fluid loss, e.g. due to vomiting or diarrhoea, and this may lead to general muscle paralysis. Symbol: K.

Subjects: Science and Mathematics — Medicine and Health.

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