Question 1

Which connective tissue layer directly surrounds each individual muscle fiber in skeletal muscle?

Accepted Answer

Endomysium

Question 2

A muscle that opposes or reverses a particular movement is called a(n):

Accepted Answer

Antagonist

Question 3

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

Accepted Answer

Multipennate

Question 4

The prime mover of arm abduction at the shoulder joint is the:

Accepted Answer

Deltoid

Question 5

Which muscle is the primary force for closing the jaw during mastication?

Accepted Answer

Masseter

Question 6

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 7

Which muscle is the prime mover of inspiration, increasing thoracic volume by flattening when it contracts?

Accepted Answer

Diaphragm

Question 8

A patient is unable to abduct their arm at the shoulder. Which nerve or muscle is most likely affected?

Accepted Answer

Deltoid muscle

Question 9

Which of the following muscles is responsible for dorsiflexion of the foot at the ankle?

Accepted Answer

Tibialis anterior

Question 10

During a sit-up, which muscle is primarily responsible for flexing the vertebral column?

Accepted Answer

Rectus abdominis

Question 11

Which muscle group is the prime mover for extension of the knee?

Accepted Answer

Quadriceps femoris

Question 12

A muscle that helps the prime mover by reducing undesirable or unnecessary movement is called a:

Accepted Answer

Synergist

Question 13

Which of the following best describes the function of the pelvic diaphragm?

Accepted Answer

Seals the inferior opening of the pelvis and supports pelvic organs

Question 14

Which muscle is the prime mover of tongue protrusion and helps anchor the tongue to prevent airway obstruction?

Accepted Answer

Genioglossus

Question 15

Which of the following statements about muscle attachments is correct?

Accepted Answer

Most skeletal muscles attach to bone via indirect attachments using tendons or aponeuroses

Question 16

A patient presents with difficulty extending their forearm at the elbow. Which muscle is most likely impaired?

Accepted Answer

Triceps brachii

Question 17

Which of the following muscles is NOT part of the rotator cuff?

Accepted Answer

Teres major

Question 18

Which muscle is primarily responsible for plantar flexion of the foot when the knee is extended?

Accepted Answer

Gastrocnemius

Question 19

Which of the following best describes the action of the external oblique muscles?

Accepted Answer

Compresses abdominal contents and flexes vertebral column

Question 20

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

Accepted Answer

Zygomaticus major

Muscles of the Body: Structure, Function, and Organization

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