Chapter 10

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65 terms · The Muscular System

False

A pair of tweezers is a good example of a second-class lever.

False

Both first- and second-class levers operate at a mechanical disadvantage.

False

Although all skeletal muscles have different shapes, the fascicle arrangement of each muscle is exactly the same.

True

Muscles are only able to pull, they never push.

False

The anconeus muscle flexes the knee and stabilizes the patella.

True

Movements of the thigh are accomplished by muscles anchored to the pelvic girdle.

True

The insertion of the biceps brachii is on the radius.

False

The chewing muscle covering the ramus of the mandible is the buccinator.

False

A prime mover of the arm that acts in adduction would be the deltoid.

True

The soleus is a synergist of the gastrocnemius used in plantar flexion.

False

Muscles that help to maintain posture are often called synergists.

True

In order to propel food down to the esophagus, the pharyngeal constrictor muscles would be used.

False

Plantar flexion at the ankle joint is accomplished by the tibialis anterior muscle.

True

The arrangement of a muscleʹs fascicles determines its range of motion and power.

True

Muscle power does not depend on the direction of the fascicles.

True

The calcaneal tendon (Achilles tendon) is the largest, strongest tendon in the body.

True

The epicranius or occipitofrontalis has two bellies, the frontal and occipital.

True

Electromyography is the recording and interpretation of graphic records of the electrical activity of contracting muscles.

False

Severing of the patellar tendon would inactivate the hamstring group.

True

The broadest muscle of the back is the latissimus dorsi.

True

Muscle spasms of the back would often include the erector spinae.

False

Muscles connecting to the hyoid bone are instrumental in speech.

a first-class lever

Scissors demonstrate which type of lever?

fibularis tertius

What muscle is responsible for keeping your toes from dragging when walking?

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

What is the major factor controlling the manner in which levers work?

the fascicles are short and attach obliquely to a central tendon that runs the length of a muscle

With regard to muscle fiber arrangement in a pennate muscle ________.

the total number of muscle cells available for contraction

What primarily determines the power of a muscle?

an agonist

A muscle that provides the major force for producing a specific movement is called ________.

the muscle has two, three, or four origins, respectively

When the term biceps, triceps, or quadriceps forms part of a muscleʹs name, you can assume that ________.

There are over 600 muscles in the body.

Which of the following statements is true regarding the total number of skeletal muscles in the human body?

the muscle elevates and/or adducts a region

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 ________.

are a group of muscles that lie superior to the hyoid bone and help form the floor of the oral cavity

The suprahyoid muscles ________.

to stabilize the shoulder joint and help prevent downward location of the humerus and to assist in abduction

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

extends and abducts the wrist and is short

The extensor carpi radialis brevis ________.

circular muscles

The muscles that are found at openings of the body are collectively called ________.

the frontal belly of the epicranius

To produce horizontal wrinkles in the forehead, which of the following muscles is involved?

genioglossus

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?

the scalenes

Which group of muscles flexes and rotates the neck?

the sartorius

Which of the following muscles is involved in crossing one leg over the other while in a sitting position?

the gastrocnemius

Which of the following muscles inserts by the calcaneal tendon?

load is far from the fulcrum and the effort is applied near the fulcrum

If a lever operates at a mechanical disadvantage, it means that the ________.

coccygeus

Which of the following does not compress the abdomen?

synergist

A muscle group that works with and assists the action of a prime mover is a(n) ________.

infraspinatus

A muscle located on the dorsal side of the body is the ________.

gracilis

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

buccinator

A nursing infant develops a powerful sucking muscle that adults also use for whistling called the ________.

sternocleidomastoid

Spasms of this straplike muscle often result in wryneck or torticollis.

During contraction the two articulating bones move equally.

Which generalization concerning movement by skeletal muscles is not true?

the type of muscle fibers

Which of these is not a way of classifying muscles?

triceps brachii acts as antagonist

In flexing the forearm at the elbow, the ________.

closes, purses, and protrudes the lips

Orbicularis oris ________.

muscles look like a feather

In a pennate muscle pattern ________.

unipennate

The extensor digitorum longus has which type of fascicle arrangement?

the brachioradialis

Tennis players often complain about pain in the arm (forearm) that swings the racquet. What muscle is usually strained under these conditions?

internal intercostals and diaphragm.

To exhale forcibly, one would contract the:

iliopsoas and rectus femoris

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

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

First-class levers ________.

All act on the tongue.

What do geniohyoid, hyoglossus, and stylohyoid have in common?

medial compartment of the thigh

Adductor magnus, adductor longus, and adductor brevis are parts of a large muscle mass of the ________.

deltoid

Which of the following muscles is involved in abduction?

adductor magnus

Which of the following muscles is a flexor of the thigh?

tibialis anterior

Which of the following muscles is involved in inversion at the ankle joint?

the vastus lateralis

Which of the following muscles serves as a common intramuscular injection site, particularly in infants?

hamstring muscles

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

popliteus

Which of the following muscles does not act in plantar flexion?

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