When muscles contract to move extremities away from the body's center line

A) ​abduction
B) ​anchor
C) ​aponeurosis
D) ​biceps
E) ​cramp
F) ​deltoid
G) ​dystrophy
H) ​gastrocnemius
I) ​gluteus medius
J) ​hamstring
K) ​hiccough
L) ​intercostal
M) ​musculoskeletal
N) ​pectoralis major
O) ​peristalsis

Abduction

The movement of a limb or other part away from the midline of the body or from another part.

Extremities

The terminal parts of the body—the arms, legs.

Center Line

A reference line that runs down the center of an object or space, commonly used in design and engineering to mark symmetry or alignment.