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.
<span>The correct answer is C. make sure that the positions of the bike seat and handles are appropriate for your height. If the seat is too high you can fail to reach the pedals and fall or if it's too low you'll put a high strain on your knees and you'll get injured and exhausted more easily. Setting it up properly is an extremely important thing.</span>
D. The volume of blood pumped by the heart increases
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