Question

1.Pete tore his subscapularis muscle while he was pitching a baseball. Which of the following muscles can help compensate for the action of the subscapularis muscle while Pete recovers?

Multiple Choice

• Infraspinatus

• Coracobrachialis

• Pectoralis major

• Supraspinatus

2. Mika is a soccer player whose athletic trainer wants to keep her healthy and insists that she work out the muscles of her thigh that help her extend her knee, and the muscles that antagonize that action. Her athletic trainer has designed exercises for her to work on actions that antagonize extension of her knee. These exercises target which of the following muscles?

Multiple Choice

• Adductor longus

• Vastus medialis

• Semimembranosus

• Gastrocnemius

Answer 1

1) CORRECT ANSWER : Pectoralis Major

EXPLANATION: The main action of the pectoralis major is horizontal Adduction and assists in internal rotation. Subscapularis is an internal rotator of the shoulder and any injury to this muscle causes loss of internal rotation. In this case pectoralis major muscle can compensate subscapularis action.

2) CORRECT ANSWER: Semimembranosus

EXPLANATION: In this case the agonist is knee extensor( Quadriceps) and antagonist is knee flexor( hamstring). Semimembranosus is one of the hamstring muscles and antagonist of knee extensor which is targeted by athletic trainer.