A ______ most directly results in the contraction of a muscle cell.
A) membrane potential
B) muscle action potential
C) nerve action potential
D) graded potential

Question

Quizplus · Accepted Answer

A muscle action potential is a brief electrical signal that travels along the sarcolemma of a muscle cell, causing the release of calcium ions from the sarcoplasmic reticulum. The calcium ions then bind to the protein troponin, leading to a conformational change in the troponin-tropomyosin complex and exposing the binding sites on actin filaments. This allows myosin heads to interact with the actin filaments, resulting in muscle contraction. Thus, a muscle action potential directly leads to contraction of a muscle cell.

A ______ Most Directly Results in the Contraction of a Muscle