When a nerve cell terminates at a muscle cell, the action potential causes opening of _____ channels that results in muscle contraction. A)Na⁺ B)K⁺ C)Ca²⁺ D)Cl^- E)none of the above

Question

Quizplus · Accepted Answer

Calcium (Ca) channels are responsible for muscle contraction. When an action potential reaches the end of a nerve cell, it triggers the release of Ca ions, which bind to proteins in the muscle cells and ultimately result in muscle contraction. Na (sodium), K (potassium), and Cl (chloride) channels do not directly cause muscle contraction.

When a Nerve Cell Terminates at a Muscle Cell, the Action