Question 1

Which muscle is primarily responsible for closing the lips, as in puckering for a kiss?

Accepted Answer

Orbicularis oris

Question 2

A patient is unable to move their eye laterally. Which cranial nerve is most likely damaged?

Accepted Answer

VI (abducens)

Question 3

Which muscle type is characterized by fascicles arranged in concentric rings and is found around the mouth?

Accepted Answer

Circular

Question 4

During chewing, which muscle is primarily responsible for elevating the mandible?

Accepted Answer

Masseter

Question 5

A person with damage to the sternocleidomastoid muscle would have difficulty performing which action?

Accepted Answer

Rotating the head to the opposite side

Question 6

Which muscle group is primarily responsible for extending the vertebral column?

Accepted Answer

Erector spinae

Question 7

If a patient cannot depress their eye and turn it laterally, which muscle and cranial nerve are most likely affected?

Accepted Answer

Superior oblique muscle and IV (trochlear) nerve

Question 8

Which of the following muscles is NOT involved in swallowing?

Accepted Answer

Sternocleidomastoid

Question 9

Which muscle is responsible for compressing the cheeks, as in blowing a trumpet?

Accepted Answer

Buccinator

Question 10

A patient presents with difficulty elevating their shoulders and retracting their scapulae. Which muscle is most likely weakened?

Accepted Answer

Trapezius

Question 11

Which of the following best describes the action of the external intercostal muscles during breathing?

Accepted Answer

Elevate the ribs during inspiration

Question 12

Which muscle is a major flexor of the forearm and is classified as a fusiform muscle?

Accepted Answer

Biceps brachii

Question 13

Which muscle is responsible for elevating the eyebrows and wrinkling the forehead?

Accepted Answer

Frontal belly of the epicranius

Question 14

Which of the following muscles is innervated by the abducens nerve (cranial nerve VI)?

Accepted Answer

Lateral rectus

Question 15

A patient has difficulty depressing their mandible (opening their mouth). Which muscle is most likely impaired?

Accepted Answer

Digastric

Question 16

Which muscle is primarily responsible for flexing the neck and rotating the head to the opposite side?

Accepted Answer

Sternocleidomastoid

Question 17

Which of the following muscles is NOT part of the erector spinae group?

Accepted Answer

Quadratus lumborum

Question 18

Which muscle is responsible for elevating the hyoid bone during swallowing?

Accepted Answer

Mylohyoid

Question 19

Which of the following best describes the function of the diaphragm during inspiration?

Accepted Answer

Contracts and moves downward, increasing thoracic volume

Question 20

A patient presents with an inability to elevate their eye and turn it laterally. Which muscle is most likely affected?

Accepted Answer

Inferior oblique

Muscular System: Structure, Function, and Key Muscles of the Human Body

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