Homeostasis is the maintaining of a stable and healthy environment in any organism. Any disease is fundamentally a disruption of this stability, causing some kind of disorder in the organism's inner functions.
One possibility is that they broke a bone in their ankle, but there are probably others.
It is normally 100-120 so it is the first option. I hope this helps you.
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At the onset of a muscle contraction, the presence of calcium triggers the opening of the Na-K channels in the membrane. Potassium is a calcium inhibitor, so as the potassium flows out of the cell, it eventually reduces the presence of calcium. This causes the closure of the Na-K channel (negative feedback mechanism). In a hypokalemic state, the lack of sufficient K doesn't inhibit the calcium channel, and in turn doesn't properly terminate the muscle contraction at the cellular level.
