Endurance athletes may suffer from muscle fatigue when contraction of the muscle fibres is disrupted. It is thought that the disruption of the contraction of muscles is caused by a lack of calcium ions within the muscle fibre. The body controls the concentration of calcium ions circulating in the blood. This concentration is kept within the range 80 to $$\(100 \mathrm{mg} \mathrm{dm}^{-3}\)$$. Name the type of process involved in maintaining calcium ion concentrations within this range. (1) ................................................................................................................................................................................................................................................................................

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