Chapter 10 The Muscular System
Scissors demonstrate which type of lever?
A) a first-class lever
B) a second-class lever
C) a third-class lever
D) a fourth-class lever
What muscle is responsible for keeping your toes from dragging when walking?
A) extensor digitorum
B) tibialis anterior
C) extensor hallicus longus
D) fibularis tertius
What is the major factor controlling the manner in which levers work?
A) the structural characteristics of the muscles of the person using the lever
B) the weight of the load
C) the direction the load is being moved
D) the difference in the positioning of the effort, load, and fulcrum
With regard to muscle fiber arrangement in a pennate muscle ________.
A) the fascicles are short and attach obliquely to a central tendon that runs the length of a
B) the fascicular pattern is circular
C) the fascicles form a triangle
D) the fascicles are in a fusiform arrangement
What primarily determines the power of a muscle?
A) the length
B) the shape
C) the number of neurons innervating it
D) the total number of muscle cells available for contraction
A muscle that provides the major force for producing a specific movement is called ________.
A) a synergist
B) an agonist
C) an antagonist
D) a fixator
When the term biceps, triceps, or quadriceps forms part of a muscleʹs name, you can assume that
A) the muscle has two, three, or four origins, respectively
B) the muscle is able to change direction twice, three times, or four times faster than other
C) the muscle has two, three, or four functions, respectively
D) the muscle has two, three, or four insertions, respectively
Which of the following statements is true regarding the total number of skeletal muscles in the
A) There are approximately the same number of muscles as bones: 206.
B) There are approximately 350 muscles in the body.
C) There are over 600 muscles in the body.
D) If one considers the very tiny, insignificant muscles, there are over 1000 muscles in the
The names of muscles often indicate the action of the muscle. When the term levator is part of
the descriptive term for a muscleʹs action, this means that ________.
A) the muscle flexes and rotates a region
B) the muscle is a fixator and stabilizes a bone or joint
C) the muscle elevates and/or adducts a region
D) the muscle functions as a synergist
The suprahyoid muscles ________.
A) depress the larynx and hyoid bone if the mandible is fixed
B) are a group of muscles that lie superior to the hyoid bone and help form the floor of the
C) move the pharynx superiorly during swallowing
D) are often called strap muscles
The supraspinatus is named for its location on the posterior aspect of the scapula above the
spine. What is its action?
A) to help hold the head of the humerus in the glenoid cavity and rotate the humerus
B) to stabilize the shoulder joint and help prevent downward location of the humerus and
to assist in abduction
C) to extend and medially rotate the humerus and to act as a synergist of the latissimus
D) to flex and adduct the humerus and to act as a synergist of the pectoralis major
The extensor carpi radialis brevis ________.
A) extends and abducts the wrist and is short
B) extends and adducts the wrist and has a small tendon
C) supinates the forearm and is a superficial muscle
D) extends the thumb and is a deep muscle
The muscles that are found at openings of the body are collectively called ________.
A) convergent muscles
B) circular muscles
C) parallel muscles
D) divergent muscles
To produce horizontal wrinkles in the forehead, which of the following muscles is involved?
A) the medial pterygoid
B) the zygomaticus major
C) the frontal belly of the epicranius
D) the temporalis
A cute, little curly haired child is sitting behind you in church. You turn around for a moment
and she sticks her tongue out at you. Which tongue muscle did she use?
A) orbicularis oris
Which group of muscles flexes and rotates the neck?
A) the scalenes
B) the iliocostalis
C) the spinalis
D) the splenius
Which of the following muscles is involved in crossing one leg over the other while in a sitting
A) the gastrocnemius
B) the sartorius
C) all of the hamstrings
D) the quadriceps femoris
Which of the following muscles inserts by the calcaneal tendon?
A) the semitendinosus
B) the sartorius
C) the tibialis anterior
D) the gastrocnemius
If a lever operates at a mechanical disadvantage, it means that the ________.
A) load is far from the fulcrum and the effort is applied near the fulcrum
B) lever system is useless
C) effort is farther than the load from the fulcrum
D) load is near the fulcrum and the effort is at the distal end
Which of the following does not compress the abdomen?
A) internal oblique
B) external oblique
C) transversus abdominis
A muscle group that works with and assists the action of a prime mover is a(n) ________.
A muscle located on the dorsal side of the body is the ________.
A) pectoralis minor
B) rectus femoris
C) rectus abdominis
Which of the following is not a member of the hamstrings?
D) biceps femoris
A nursing infant develops a powerful sucking muscle that adults also use for whistling called
Spasms of this straplike muscle often result in wryneck or torticollis.
A) serratus anterior
Which generalization concerning movement by skeletal muscles is not true?
A) Muscles produce movement by pulling on bones.
B) The bones serve as levers.
C) During contraction the two articulating bones move equally.
D) The movements produced may be of graded intensity.
Which of these is not a way of classifying muscles?
A) muscle location
B) the type of muscle fibers
C) the type of action they cause
D) muscle shape
In flexing the forearm at the elbow, the ________.
A) biceps brachii acts as antagonist
B) triceps brachii acts as antagonist
C) brachioradialis acts as antagonist
D) coracobrachialis acts as antagonist
Orbicularis oris ________.
A) closes, purses, and protrudes the lips
B) pulls the lower lip down and back
C) draws the eyebrows together
D) allows blinking, squinting, and various other protective mechanisms for the eye
In a pennate muscle pattern ________.
A) muscles appear to be straplike
B) there is a narrow origin diverging to a broad insertion
C) there is a broad origin and fascicles converge toward a single tendon
D) muscles look like a feather
The extensor digitorum longus has which type of fascicle arrangement?
Tennis players often complain about pain in the arm (forearm) that swings the racquet. What
muscle is usually strained under these conditions?
A) the triceps brachii
B) the anconeus
C) the brachioradialis
D) the flexor digitorum profundus
To exhale forcibly, one would contract the:
A) diaphragm alone.
B) internal intercostals and rectus abdominus.
C) external intercostals and diaphragm.
D) rectus abdominis and diaphragm.
Paralysis of which of the following would make an individual unable to flex the thigh?
B) vastus medialis
D) iliopsoas and rectus femoris
First-class levers ________.
A) have load at one end of the lever, fulcrum at the other, and effort applied somewhere in
B) are typified by tweezers or forceps
C) in the body can operate at a mechanical advantage or mechanical disadvantage,
depending on specific location
D) are the type found in the joints forming the ball of the foot as used in raising the body on
What do geniohyoid, hyoglossus, and stylohyoid have in common?
A) All names reflect direction of muscle fibers.
B) Each acts synergistically to elevate the jaw.
C) All act on the tongue.
D) All names indicate the relative size of the muscle.
Adductor magnus, adductor longus, and adductor brevis are parts of a large muscle mass of
A) lateral rotators
B) anterior compartment of the thigh
C) posterior muscle group of the thigh
D) medial compartment of the thigh
Which of the following muscles is most involved in abduction?
C) teres major
D) latissimus dorsi
Which of the following muscles is a flexor of the thigh?
A) tibialis posterior
B) vastus lateralis
C) adductor magnus
D) gluteus maximus
Which of the following muscles is involved in inversion at the ankle joint?
A) tibialis anterior
B) extensor digitorum longus
C) peroneus tertius
D) peroneus longus
Which of the following muscles serves as a common intramuscular injection site, particularly
A) the vastus intermedius
B) the vastus medialis
C) rectus femoris
D) the vastus lateralis
Paralysis of which of the following would make an individual unable to flex the knee?
A) hamstring muscles
B) gluteal muscles
Which of the following muscles does not act in plantar flexion?
B) tibialis posterior
C) flexor digitorum longus
D) gastrocnemius and soleus
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