Excitation-contraction coupling requires which of the following substances?
A) Ca²⁺ and ATP
B) Ca²⁺ only
C) ATP only
D) ATP and glucose

Question

Quizplus · Accepted Answer

Excitation-contraction coupling requires both Ca²⁺ and ATP. Ca²⁺ is necessary for the contraction of muscle fibers, and ATP is required for the myosin head to bind to actin during muscle fiber contraction. Glucose is used for energy production but is not directly involved in excitation-contraction coupling.

Excitation-Contraction Coupling Requires Which of the Following Substances