What is the role of calcium in muscle contraction?
Oa. Calcium transmits the signal from the motor neuron to the muscle fiber that then triggers the action potential that moves along the sarcolemma.
Ob. Calcium interacts with troponin and tropomyosin to expose the active sites on actin.
Oc. Calcium provides an additional source of ATP.
Od. Calcium provides the energy to move the myosin heads