Answer to Question #60356 in Human Anatomy and Physiology for Sanjukta Ghosh
(I've read an article on Wikipedia about how low extracellular Ca2+ cause involuntary muscle contraction/tetany but I don't get it at all.)
In the other hand, calcium controls the contraction and relaxation of muscles. In the case of low blood calcium level muscles spasm and cannot relax. When muscle fibers contract, the head of the muscle proteins, also known as myofibrils, attach to strings known as actin filaments. Calcium is needed for the disassociation of myofibrils from actin in order for muscle relaxation. Because of muscle`s cell contains small stores of calcium they are released when a muscle needs to relax. But if calcium levels are too low muscles will be unable to relax, resulting in tetany.
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