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.
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See the answer below, please.
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The different treatments for anemia can be: iron supplements (for example for iron deficiency anemia), vitamin B12 or folic acid (for megaloblastic anemias), erythropoietin that stimulates the synthesis of blood cells in bone marrow, and in more serious cases, transfusions of blood.