Question

required information
calcium ions return to the sarcoplasmic reticulum, detaching the cross - bridges so the sarcomere can lengthen, during the ____________ phase.
multiple choice
excitation
coupling
relaxation
contraction

Explanation:

During muscle relaxation, calcium ions return to the sarcoplasmic reticulum. This causes the detachment of cross - bridges, allowing the sarcomere to lengthen. In the excitation phase, muscle fibers are stimulated. Coupling is the link between excitation and contraction. In the contraction phase, cross - bridges form and the sarcomere shortens.

Answer:

C. relaxation