Which of the following does not consist solely of involuntary muscles?

Which of the following is both a structural and functional protein?

The central part of the thick filament which is not overlapped by thin filaments is called as:

What is the location of troponin in the process of muscle contraction?

Choose the correct statements regarding muscle contraction. $A$. $A$ motor neuron carries a signal sent by the Central Nervous System $(CNS)$ to the sarcolemma of the muscle fibre. $B$. The neural signal generates an action potential which causes the release of $Ca^{++}$ into sarcoplasm. $C$. Increase in $Ca^{++}$ inactivates the actin for breaking cross bridges. $D$. Actin binds to the myosin head to form a cross bridge. $E$. Shortening of sarcomere takes place, by pulling actin filaments towards the centre of '$A$' band. Choose the correct answer from the options given below:

$I-$bands of myofibrils are bisected by