Question 1

Which connective tissue layer surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Question 2

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

Accepted Answer

Orbicularis oculi

Question 3

Which muscle is the prime mover for jaw closure during mastication?

Accepted Answer

Masseter

Question 4

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

Accepted Answer

Flexion of the head and rotation to the opposite side

Question 5

Which muscle is primarily responsible for increasing the volume of the thoracic cavity during inspiration?

Accepted Answer

Diaphragm

Question 6

A muscle that assists the prime mover by reducing undesirable movements is called a:

Accepted Answer

Synergist

Question 7

Which of the following best describes the arrangement of fascicles in the deltoid muscle?

Accepted Answer

Multipennate

Question 8

If a muscle is named 'biceps brachii,' what does the prefix 'biceps' indicate?

Accepted Answer

It has two origins

Question 9

Which muscle is responsible for compressing the cheek, as in whistling or holding food between teeth?

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 muscle is the prime mover for arm abduction at the shoulder joint?

Accepted Answer

Deltoid

Question 12

During forced expiration, which muscle group is primarily responsible for depressing the rib cage?

Accepted Answer

Internal intercostals

Question 13

Which of the following muscles is NOT involved in mastication?

Accepted Answer

Platysma

Question 14

A muscle with fibers running straight parallel to the midline is likely to have which term in its name?

Accepted Answer

Rectus

Question 15

Which muscle forms the main muscular part of the pelvic floor and supports pelvic organs?

Accepted Answer

Levator ani

Question 16

If the right sternocleidomastoid muscle contracts unilaterally, what is the resulting movement of the head?

Accepted Answer

Rotation of the head to the left

Question 17

Which muscle is the primary mover for tongue protrusion and helps anchor the tongue to prevent airway obstruction?

Accepted Answer

Genioglossus

Question 18

A muscle that acts as an antagonist to the biceps brachii during elbow flexion is the:

Accepted Answer

Triceps brachii

Question 19

Which of the following best describes the function of the erector spinae muscle group?

Accepted Answer

Extension and maintenance of erect posture

Question 20

A patient is unable to smile on one side of their face. Which muscle is most likely paralyzed?

Accepted Answer

Zygomaticus major

Comprehensive Study Notes: The Muscular System (Anatomy & Physiology)

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