The dark bands ($A$-bands) of a skeletal muscle are known as

Globular protein which masks active sites on $G$-actin is :-

Actin filament is made up of

The triceps muscle connects the ulna with which of the following bones?

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.

Myoglobin is found in