Question 1

Which of the following best describes the function of a fixator muscle during movement?

Accepted Answer

It stabilizes the bone that is the attachment for the prime mover’s origin.

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 shape is characterized by fascicles converging to a single attachment point, such as the pectoralis major?

Accepted Answer

Convergent

Question 4

During a biceps brachii contraction, which structure connects the muscle to the forearm bone?

Accepted Answer

Tendon

Question 5

If the rectus femoris is damaged, which movement would be most affected?

Accepted Answer

Extension of the lower leg

Question 6

Which of the following muscles is classified as a multipennate muscle?

Accepted Answer

Deltoid

Question 7

A person is having difficulty swallowing and speaking. Which group of muscles is most likely impaired?

Accepted Answer

Suprahyoid and infrahyoid muscles

Question 8

Which muscle type is best suited for high endurance activities due to its fiber arrangement?

Accepted Answer

Parallel

Question 9

The diaphragm separates which two cavities in the human body?

Accepted Answer

Thoracic and abdominal

Question 10

Which muscle is primarily responsible for flexing the lower arm at the elbow?

Accepted Answer

Biceps brachii

Question 11

A patient presents with weakened pelvic floor muscles. Which function is most likely compromised?

Accepted Answer

Support of pelvic organs and resistance to intra-abdominal pressure

Question 12

Which of the following best describes the action of antagonistic muscles?

Accepted Answer

They produce the opposite action to the prime mover.

Question 13

Which muscle group is responsible for dorsiflexion of the foot?

Accepted Answer

Anterior compartment of the lower leg

Question 14

The muscles of facial expression typically insert into which structure?

Accepted Answer

Skin surrounding the eyelids, nose, and mouth

Question 15

Which of the following equations best represents the relationship between muscle force ($$F$$), lever arm length ($$r$$), and torque ($$	au) $$generated during movement?

Accepted Answer

$$	au = F 	imes r$$

Question 16

A muscle with concentrically arranged fascicles that forms a sphincter is classified as which type?

Accepted Answer

Circular

Question 17

Which muscle is a synergist in flexing the lower arm, assisting the biceps brachii?

Accepted Answer

Brachioradialis

Question 18

If a person cannot extend their fingers, which muscle is most likely impaired?

Accepted Answer

Extensor digitorum

Question 19

Which muscle group is primarily responsible for moving the humerus superiorly?

Accepted Answer

Deltoids

Question 20

A patient has difficulty flexing their toes. Which layer of the foot muscles is most likely affected?

Accepted Answer

Plantar muscles

The Muscular System: Structure, Function, and Major Muscles

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