Question 1

Which muscle is considered the prime mover for flexion of the forearm at the elbow joint?

Accepted Answer

Biceps brachii

Question 2

During a yoga pose that requires holding the body off the ground with the arms (as shown in Figure 11.1), which muscle group is primarily responsible for stabilizing the scapulae?

Accepted Answer

Trapezius and serratus anterior

Question 3

Which of the following best describes the function of synergist muscles during movement?

Accepted Answer

They assist the prime mover in performing its action.

Question 4

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

Accepted Answer

Orbicularis oculi

Question 5

Which muscle is responsible for the main movement of chewing (elevation of the mandible)?

Accepted Answer

Masseter

Question 6

The diaphragm is essential for which physiological process?

Accepted Answer

Respiration

Question 7

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

Accepted Answer

Teres major

Question 8

A person suffers a deep laceration to the anterior forearm and loses the ability to flex their fingers. Which muscle group is most likely damaged?

Accepted Answer

Flexor digitorum group

Question 9

Which muscle is primarily responsible for dorsiflexion of the foot at the ankle?

Accepted Answer

Tibialis anterior

Question 10

The pelvic floor muscles play a crucial role in which of the following functions?

Accepted Answer

Support of pelvic organs and continence

Question 11

Which muscle is the main abductor of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 12

A patient presents with foot drop, an inability to dorsiflex the foot. Which nerve and muscle are most likely involved?

Accepted Answer

Deep fibular (peroneal) nerve and tibialis anterior

Question 13

Which of the following best describes the arrangement of muscle fibers in the rectus abdominis?

Accepted Answer

Parallel

Question 14

If a muscle is named 'adductor pollicis', what is its primary action and target?

Accepted Answer

Adduction of the thumb

Question 15

Which muscle is responsible for the main movement of plantar flexion at the ankle joint?

Accepted Answer

Gastrocnemius

Question 16

A patient has difficulty swallowing and speaking. Which group of muscles is most likely affected?

Accepted Answer

Suprahyoid and infrahyoid muscles

Question 17

Which of the following equations best represents the force generated by a muscle, given the cross-sectional area (CSA) and the specific tension (T) of the muscle fibers?

Accepted Answer

$$F = T 	imes CSA$$

Question 18

Which muscle is primarily responsible for flexing the thigh at the hip joint?

Accepted Answer

Iliopsoas

Question 19

A patient is unable to abduct their fingers. Which intrinsic hand muscle group is most likely affected?

Accepted Answer

Dorsal interossei

Question 20

Which of the following best explains why pennate muscles can generate more force than parallel muscles of the same size?

Accepted Answer

Pennate muscles have more fibers packed into a given area.

The Muscular System: Structure, Function, and Major Muscle Groups

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