Shivering with cold in winter is caused by

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

Which of the following statements are correct regarding skeletal muscle?
$A$. Muscle bundles are held together by a collagenous connective tissue layer called fascicle.
$B$. Sarcoplasmic reticulum of muscle fibre is a storehouse of calcium ions.
$C$. Striated appearance of skeletal muscle fibre is due to the distribution pattern of actin and myosin proteins.
$D$. $M$ line is considered as the functional unit of contraction called sarcomere.
Choose the most appropriate answer from the options given below:

Striated muscle fibers are found in......

Proprioceptors are present in . . . . . . .

The sliding filament theory can be best explained as: