Question

Shoulder abduction is a result of the force-coupling between which muscles?

a) Biceps and triceps
b) Pectoralis major and latissimus dorsi
c) Deltoid and supraspinatus
d) Quadriceps and hamstrings

Answer 1

Shoulder abduction is a result of the force-coupling between the deltoid and supraspinatus muscles.

Step-by-step explanation:

Shoulder abduction is a result of the force-coupling between the deltoid and supraspinatus muscles. The deltoid, a thick muscle that creates the rounded lines of the shoulder, is the major abductor of the arm. The supraspinatus muscle, located superior to the spine of the scapula, also contributes to the abduction of the arm.