A Cation That is Essential for Muscle Contraction, Nerve Function

Question

A cation that is essential for muscle contraction, nerve function, and blood clotting is
A) sodium.
B) potassium.
C) calcium.
D) magnesium.
E) selenium.

Accepted Answer

Calcium is the cation that is essential for muscle contraction, nerve function, and blood clotting. It plays a critical role in the release of neurotransmitters, muscle contraction, and the activation of enzymes involved in blood clotting. Sodium and potassium also play important roles in muscle and nerve function, but they are not as critical in blood clotting. Magnesium and selenium are important for various physiological processes but they are not as essential for muscle contraction and blood clotting as calcium.