Question 1

Which of the following best describes the fascicle arrangement of the orbicularis oris muscle?

Accepted Answer

Circular

Question 2

A patient is unable to abduct their arm at the shoulder joint. Which muscle is most likely impaired?

Accepted Answer

Deltoid

Question 3

Which muscle acts as a fixator during a biceps curl, stabilizing the scapula so the biceps brachii can flex the elbow?

Accepted Answer

Serratus anterior

Question 4

The rectus femoris muscle is an example of which fascicle arrangement?

Accepted Answer

Bipennate

Question 5

Which muscle is the prime mover (agonist) for flexion of the forearm at the elbow?

Accepted Answer

Biceps brachii

Question 6

A patient presents with difficulty elevating their shoulders (shrugging). Which muscle is most likely affected?

Accepted Answer

Trapezius

Question 7

Which of the following muscles is responsible for compressing the abdominal contents during forced expiration?

Accepted Answer

Transversus abdominis

Question 8

During mastication, which muscle acts as the antagonist to the masseter?

Accepted Answer

Lateral pterygoid

Question 9

Which muscle is primarily responsible for plantar flexion of the foot at the ankle joint?

Accepted Answer

Gastrocnemius

Question 10

If the external intercostal muscles are paralyzed, which physiological process would be most directly impaired?

Accepted Answer

Inspiration

Question 11

Which muscle is the main antagonist to the biceps brachii during elbow flexion?

Accepted Answer

Triceps brachii

Question 12

A patient has difficulty extending their knee. Which muscle group is most likely weakened?

Accepted Answer

Quadriceps femoris

Question 13

Which of the following muscles is named for its action?

Accepted Answer

Flexor carpi radialis

Question 14

Which muscle is a synergist to the gastrocnemius in plantar flexion?

Accepted Answer

Soleus

Question 15

Which muscle is responsible for the lateral rotation of the thigh at the hip joint?

Accepted Answer

Gluteus maximus

Question 16

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

Accepted Answer

Parallel

Question 17

A patient is unable to whistle or pucker their lips. Which muscle is most likely paralyzed?

Accepted Answer

Orbicularis oris

Question 18

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

Accepted Answer

Iliopsoas

Question 19

Which muscle is the main fixator of the scapula during arm abduction?

Accepted Answer

Serratus anterior

Question 20

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

Accepted Answer

Tibialis anterior

The Muscular System: Structure, Function, and Organization

Study Guide - Practice Questions