Examlex
Which one of the following is a polyatomic cation?
Calcium Ions
Charged particles of calcium that play key roles in blood clotting, muscle contraction, and nerve function.
Troponin
A complex of three regulatory proteins involved in muscle contraction in skeletal and cardiac muscles.
Tropomyosin
A protein that regulates muscle contraction by controlling the access of myosin to actin filaments.
Muscle Contraction
Muscle contraction is a physiological process where muscle fibers actively shorten or generate tension, often resulting in movement or the maintenance of posture.
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