1. | binds to troponin to remove the masking of active sites on actin for myosin. |
2. | activates the myosin ATPase by binding to it. |
3. | detaches the myosin head from the actin filament. |
4. | prevents the formation of bonds between the myosin cross bridges and the actin filament. |
Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
(1) Calcium
(2) Magnesium
(3) Sodium
(4) Potassium.