Question

which end of a skeletal muscle is called its origin?
o the end that is attached to a relatively unmovable or fixed part of a joint
o the end that contains the longer tendon
o the end that contains the neuromuscular junction
o the end that is attached to a movable part of a joint

Explanation:

Skeletal muscle origin is defined as the attachment to a relatively fixed part. The neuromuscular junction relates to nerve - muscle communication, tendon length isn't the defining factor for origin, and the movable attachment is the insertion.

Answer:

The end that is attached to a relatively unmovable or fixed part of a joint