The metal ions (charged particles) that are required for contraction of muscles in human beings and animals are ions of:
A
calcium
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B
sodium
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C
potassium
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D
iron
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Solution
The correct option is B calcium
Upon nervous system excitation for a contraction, calcium is released into the fiber. It binds with typonin and stimulates it to more tropomyosin, exposing the binding site for the myosin cross-bridge. Because of the positive charge of calcium, our muscle can now contract.