Question

practice it
lo 4.4. ______ ions bind the actin - myosin complex to start the muscle contraction process.
potassium
calcium
magnesium
sodium
chlorine

Explanation:

In muscle contraction, calcium ions bind to troponin - tropomyosin complex on actin filaments, which exposes the myosin - binding sites on actin, initiating the contraction process.

Answer:

B. Calcium