Which of the following statements correctly describes the type of muscle present in the specified body part?

The main source of energy during muscle contraction is

Which of the following statements regarding the types of muscles present in our body is correct?

Which ion binds with troponin during muscle contraction?

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.

The functional unit of the contractile system for a striated muscle is: