Which muscle tissue contracts only in response to nerve stimulation?

Cerebrospinal fluid (CSF) fills in the space between the:

In skeletal muscle, alternating light and dark bands are termed __________________. 

This muscle is used for smiling since it draws the angle of the mouth upward and laterally for laughing:

This type of muscle type aids the Prime Mover:

The longest muscle in the body is the:

Which muscle tissue contracts only in response to nerve stimulation?

Cerebrospinal fluid (CSF) fills in the space between the:

What is the structure called at the end of the blue arrow?

In a relaxed muscle fiber, the active sites of actin are blocked by _____________.