Which of the following represents the correct matching of a body part and the muscle associated with its movement?

Select the correct option for skeletal muscle.
$(I)$ In human body,it is made of a number of muscle bundles.
$(II)$ Muscle bundles contain a number of muscle fibers and each fiber is lined by the sarcolemma.
$(III)$ In a muscle fiber,the sarcoplasm contains only one nucleus.
$(IV)$ In a muscle fiber,the sarcoplasmic reticulum is the storehouse of calcium ions.

Identify the characteristics of red muscle fibers from the following:
$I -$ Many mitochondria
$II -$ Use large amounts of $O_2$ for $ATP$ production
$III -$ Low amount of myoglobin
$IV -$ Less sarcoplasmic reticulum
Which of the above are characteristic of red muscle fibers?

Shivering with cold in winter is caused by

$A$: Muscle tetanus is the phenomenon of sustained contraction of a muscle due to a succession of nerve impulses/stimuli being received by it.
$R$: Many of our daily activities are due to tetanic contraction of muscles,such as holding a book.

Both proteins,actin and myosin,are arranged in a rod-like structure in the muscles: