Striped and branched muscles are found in

The muscular contraction in which the tension remains the same and the mechanical work is also done is called

$A$ ...... muscle rotates the forearm to turn the palm downwards.

The refractory period of a muscle fibre in mammals is:

Rahul exercises regularly by visiting a gymnasium. Of late,he is gaining weight. What could be the reason? Choose the correct answer and elaborate.
$A$. Rahul has gained weight due to accumulation of fats in the body.
$B$. Rahul has gained weight due to increased muscle mass and loss of fat.
$C$. Rahul has gained weight because his muscle shape has improved.
$D$. Rahul has gained weight because he is accumulating water in the body.

The diagram given below represents the structure of a striated muscle fiber. Label the parts $A, B, C, D, E$ and $F$.