Question

Choose the correct option.

Role of calcium in muscle contraction is ______.

Options

• to break the cross-bridges as a cofactor in the hydrolysis of ATP

• to bind with troponin, changing its shape so that the actin filament is exposed

• to transmit the action potential across the neuromuscular junction.

• to re-establish the polarisation of the plasma membrane following an action potential

Answer 1

Role of calcium in muscle contraction is to bind with troponin, changing its shape so that the actin filament is exposed.