Question 1

Which muscle is primarily responsible for flexing the forearm at the elbow joint during a biceps curl exercise?

Accepted Answer

Brachialis

Question 2

A patient presents with difficulty elevating the corners of their mouth to smile. Which muscle is most likely impaired?

Accepted Answer

Levator anguli oris

Question 3

During forced expiration, which abdominal muscle contracts to increase intra-abdominal pressure?

Accepted Answer

Transversus abdominis

Question 4

Which muscle forms the bulk of the calf and is responsible for plantar flexion of the foot?

Accepted Answer

Gastrocnemius

Question 5

A baseball pitcher suffers a rotator cuff injury. Which muscle is NOT part of the rotator cuff group?

Accepted Answer

Teres major

Question 6

Which muscle is responsible for compressing the cheeks against the teeth, as in blowing or sucking?

Accepted Answer

Buccinator

Question 7

If the thoracolumbar fascia is damaged, which muscle's function would be most affected?

Accepted Answer

Erector spinae

Question 8

Which muscle is the primary extensor of the forearm at the elbow joint?

Accepted Answer

Triceps brachii

Question 9

A patient cannot dorsiflex their foot after a lower leg injury. Which muscle is most likely damaged?

Accepted Answer

Tibialis anterior

Question 10

Which muscle is responsible for elevating the eyebrows and wrinkling the forehead?

Accepted Answer

Frontal belly of occipitofrontalis

Question 11

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

Accepted Answer

Rectus abdominis

Question 12

Which muscle is most involved in abduction of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 13

A patient has difficulty pronating their forearm. Which muscle is most likely affected?

Accepted Answer

Pronator teres

Question 14

Which muscle is responsible for closing the lips, as in puckering for a kiss?

Accepted Answer

Orbicularis oris

Question 15

Which muscle is most important for stabilizing the scapula during arm movements?

Accepted Answer

Serratus anterior

Question 16

A runner complains of pain along the lateral side of the thigh. Which structure is most likely involved?

Accepted Answer

Iliotibial tract

Question 17

Which muscle is responsible for flexing the wrist and is located on the medial side of the forearm?

Accepted Answer

Flexor carpi ulnaris

Question 18

Which muscle is most involved in extending the toes?

Accepted Answer

Extensor digitorum longus

Question 19

Which muscle is responsible for elevating the mandible during chewing?

Accepted Answer

Masseter

Question 20

A patient presents with winged scapula after injury. Which nerve and muscle are most likely affected?

Accepted Answer

Long thoracic nerve and serratus anterior

Overview of Major Skeletal Muscles of the Human Body

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