1
Q
Rule 1
A
Muscles have at least two attachments and cross at least one joint.
2
Q
Rule 2
A
Muscles always pull
3
Q
Rule 3
A
The attachment that moves is called the insertion and the attachment that stays stationary is the origin.
4
Q
Rule 4
A
Muscles that decrease the angle of a joint are flexors. Muscles that increase the angle of a joint are extensors.
5
Q
Rule 5
A
Muscles work in opposing pairs.
6
Q
Rule 6
A
Muscle striations point to the attachments and show the direction of pull.
