Question 1

Which of the following best describes how skeletal muscles produce movement at a joint?

Accepted Answer

By exerting force on tendons, which pull on bones acting as levers around a fulcrum

Question 2

A patient is unable to close their eyelids tightly. Which muscle is most likely impaired?

Accepted Answer

Orbicularis oculi

Question 3

Which muscle is the primary agonist for chewing and elevating the mandible?

Accepted Answer

Masseter

Question 4

The sternocleidomastoid muscle is responsible for which of the following actions?

Accepted Answer

Flexion and rotation of the neck

Question 5

Which muscle forms the central tendon of the diaphragm and is the primary muscle of respiration?

Accepted Answer

Diaphragm

Question 6

A muscle that assists the agonist in performing its action is called a:

Accepted Answer

Synergist

Question 7

Which of the following muscles is NOT involved in mastication?

Accepted Answer

Zygomaticus major

Question 8

The external intercostal muscles are primarily responsible for which action during breathing?

Accepted Answer

Elevating the ribs during inspiration

Question 9

Which muscle is responsible for compressing the cheeks during blowing or whistling?

Accepted Answer

Buccinator

Question 10

A muscle named 'flexor carpi radialis' would most likely be located where and perform what action?

Accepted Answer

In the forearm, flexing the wrist toward the radius

Question 11

Which of the following best describes the difference between the origin and insertion of a muscle?

Accepted Answer

Origin is the stationary end; insertion is the movable end

Question 12

A patient presents with difficulty elevating their upper lip. Which muscle is most likely affected?

Accepted Answer

Levator labii superioris

Question 13

Which muscle is primarily responsible for depressing the lower lip?

Accepted Answer

Depressor labii inferioris

Question 14

Which of the following is a function of the internal oblique muscle?

Accepted Answer

Compression of the abdominal contents and rotation of the trunk

Question 15

If the left sternocleidomastoid contracts unilaterally, what movement occurs?

Accepted Answer

The head rotates to the right

Question 16

Which muscle is responsible for the 'six-pack' appearance of the abdominal wall?

Accepted Answer

Rectus abdominis

Question 17

Which of the following best describes the action of the lateral pterygoid muscle?

Accepted Answer

Protraction and side-to-side movement of the mandible

Question 18

A muscle with the name 'orbicularis' is most likely to have which of the following shapes?

Accepted Answer

Circular

Question 19

Which of the following muscles is classified as an infrahyoid muscle?

Accepted Answer

Sternohyoid

Question 20

During a forceful exhalation, which muscle group is most active in depressing the ribs?

Accepted Answer

Internal intercostals

Muscles of the Head, Neck, and Trunk: Structure, Function, and Identification

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