First slide

Muscle

Question

Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

Moderate

A

Calcium
B

Magnesium
C

Sodium
D

Potassium

Solution

Increase in Ca⁺⁺level leads to the binding of calcium with a subunit of troponin on actin filaments and thereby remove the masking of active sites for myosin.

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