51) When the diaphragm contracts, it
A) opens a hole in its center through which air flows.
B) aids in expiration.
C) becomes flatter.
D) becomes more dome-shaped.
52) Which type of fascicle arrangement shortens the least?
A) bipennate
B) circular
C) fusiform
D) parallel
53) In this arrangement of fascicles, the fascicles insert into only one side of the tendon.
A) multipennate
B) bipennate
C) unipennate
D) parallel
54) A prime mover for flexion of the arm at the shoulder is the
A) pectoralis major.
B) deltoid.
C) latissimus dorsi.
D) coracobrachialis.
55) A prime mover for extension of the forearm at the elbow is the
A) brachialis.
B) triceps brachii.
C) biceps brachii.
D) anconeus.
56) A prime mover for flexing the forearm at the elbow is the
A) triceps brachii.
B) brachialis.
C) brachioradialis.
D) anconeus.
57) An important function of the soleus muscle is to
A) extend the leg at the knee.
B) evert the foot.
C) invert the foot.
D) plantar flex the foot.
58) A muscle that originates on the medial epicondyle of the humerus is the
A) flexor carpi radialis.
B) short head of the triceps.
C) brachioradialis.
D) extensor digitorum.
59) The muscle that originates on the anterior superior iliac spine is the
A) rectus femoris.
B) sartorius.
C) pectineus.
D) psoas major.
60) A muscle that originates on the lateral surfaces of the superior eight ribs is the
A) rectus abdominis.
B) subclavius.
C) serratus anterior.
D) subscapularis.