Which fibres,contractile in nature,are found in muscles?

The term $refractory$ $period$ with reference to muscle tissue refers to:

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

In which of the following,growth is possible through increase in volume?

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.

An individual sarcomere of a myofibril consists of: