Which of the following movements in the mammalian skeleton represents the leverage of the third order,where the force is applied at a point between the fulcrum and the point of resistance?

Select the correct statements regarding the mechanism of muscle contraction.
$A.$ It is initiated by a signal sent by $\text{CNS}$ via a motor neuron.
$B.$ Neurotransmitter generates an action potential in the sarcolemma.
$C.$ Increased $Ca^{++}$ level leads to the binding of calcium with troponin on actin filaments.
$D.$ Masking of the active site of actin prevents contraction; unmasking leads to contraction.
$E.$ Utilising the energy from $\text{ATP}$ hydrolysis to form a cross-bridge.

Which of the following statements is correct regarding muscle contraction?

Select the correct option for the following processes in muscle contraction:
Cross-bridge formation $\quad$ Cross-bridge breaking

Myosin head separates from actin when:

Body contraction is due to the pulling of ....