Which is the smallest muscle in the human body?

Which sentence is not true for muscle contraction?

Define the following terms:
$(1)$ Sarcomere
$(2)$ Acromion process

The muscles which can retract are known as:

The immediate energy source for muscle contraction is:

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?