Chapter 10 quiz 12/12

What is a muscle that provides the major force for producing a specific movement called?

An antagonist

The deltoid is a prime mover of the arm that acts in adduction.

False

The soleus is an antagonist of the gastrocnemius during plantar flexion.

False

Which of the following muscles is involved in crossing one leg over the other to produce the cross-legged position?

The sartorius

________ is a powerful forearm extensor at the elbow joint.

Tricep Brachii

The major head flexors are the sternocleidomastoid muscles, with the help of the muscles attached to the hyoid bone.

True

A muscle that opposes, or reverses, a particular movement is a(n) ________.

antagonist

A nursing infant develops a powerful sucking muscle that inserts to the muscle which adults also use for whistling (orbicularis oris). What is this muscle called?

buccinator

The ________ helps keep food between the grinding surfaces of the teeth during chewing.

buccinator

The ________ extends the great toe.

extensor hallucis longus

Which of these is the function of the external oblique muscles?

flex vertebral column and compress abdominal wall

Which of the following is NOT a member of the hamstrings?

gracilis

Paralysis of which of the following muscles would make an individual unable to flex the knee?

hamstring muscles

First-class levers ________.

in the body can operate at a mechanical advantage or mechanical disadvantage, depending on specific location

Which of the following muscles is NOT a rotator cuff muscle?

levator scapulae

The ________ is the main chewing muscle.

masseter

The sternocleidomastoid muscle inserts on the ________.

mastoid process of the temporal bone

The most powerful muscle in the body is the ________.

quadriceps femoris

The quadriceps femoris is composed of three "vastus" muscles and the ________.

rectus femoris

What is the major factor controlling how levers work?

the difference in the positioning of the effort, load, and fulcrum

What is the main factor that determines the power of a muscle?

the total number of muscle (cells) available for contraction

The supraspinatus is named for its location on the posterior aspect of the scapula above the spine. What is its action?

to initiate abduction of the arm, to stabilize the shoulder joint and to help prevent downward dislocation of the humerus

The ________ runs deep to the internal oblique.

transversus abdominis

Which of the following muscles is used to form a smile?

zygomaticus major