Question 1

Which muscle fascicle arrangement is best suited for generating the greatest force, and why?

Accepted Answer

The pennate arrangement, because fascicles attach obliquely to the tendon, increasing the number of fibers per unit area.

Question 2

A patient is unable to elevate their mandible to chew food. Which muscle is most likely impaired?

Accepted Answer

Masseter

Question 3

Which of the following muscles is primarily responsible for raising the eyebrows and wrinkling the forehead?

Accepted Answer

Epicranius (frontalis)

Question 4

If the load is moved in the same direction as the applied force, which class of lever is being used?

Accepted Answer

Third-class lever

Question 5

Which muscle group is responsible for lateral bending and rotation of the vertebral column?

Accepted Answer

Transversospinalis group

Question 6

A patient presents with difficulty swallowing. Which muscle group is most likely affected?

Accepted Answer

Suprahyoid and infrahyoid muscles

Question 7

Which muscle is responsible for allowing voluntary control of urination?

Accepted Answer

External urethral sphincter

Question 8

Which of the following is NOT a function of skeletal muscle contraction?

Accepted Answer

Producing hormones for metabolism

Question 9

Which muscle is involved in depressing the lower lip and is important for facial expressions conveying sadness?

Accepted Answer

Depressor labii inferioris

Question 10

A muscle that acts as a fixator provides which of the following functions?

Accepted Answer

Anchors a bone to stabilize a joint and prevent unwanted movement.

Question 11

Which muscle group is most important for forced expiration during breathing?

Accepted Answer

Internal intercostals

Question 12

Which of the following best describes the action of the superior rectus muscle of the eye?

Accepted Answer

Moves the eyeball upward

Question 13

Which muscle is primarily responsible for protracting the scapula?

Accepted Answer

Serratus anterior

Question 14

A patient has difficulty flexing their forearm at the elbow. Which muscle is most likely impaired?

Accepted Answer

Biceps brachii

Question 15

Which abdominal muscle is responsible for compressing the abdominal contents and is oriented horizontally?

Accepted Answer

Transversus abdominis

Question 16

Which lever class is described by the equation $$F_{load} = F_{effort}$$ when the fulcrum is between the load and the applied force?

Accepted Answer

First-class lever

Question 17

If a muscle is named 'flexor carpi radialis,' what does this name indicate about its function and location?

Accepted Answer

It flexes the wrist on the radial side.

Question 18

Which muscle group is responsible for extending and laterally bending the vertebral column?

Accepted Answer

Erector spinae

Question 19

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

Accepted Answer

Orbicularis oculi

Question 20

Which of the following muscles is involved in smiling?

Accepted Answer

Zygomaticus major

Overview and Functions of Skeletal Muscles: Anatomy & Physiology Study Notes

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