Biology · PYQ NEET UG 2018
हिन्दीCalcium is important in skeletal muscle contraction because it
Correct answer · Option 3
binds to troponin to remove the masking of active sites on actin for myosin.
Explanation
Calcium ions bind to troponin on actin filaments, exposing the active binding sites for myosin heads, enabling cross-bridge formation.