Question 1

Which muscle is primarily responsible for closing the jaw during mastication?

Accepted Answer

Masseter

Question 2

A patient is unable to raise their eyebrows or wrinkle their forehead. Which muscle is most likely affected?

Accepted Answer

Frontalis

Question 3

Which muscle is involved in compressing the cheeks, such as when blowing air or sucking?

Accepted Answer

Buccinator

Question 4

If the sternocleidomastoid muscle contracts on one side only, what movement occurs?

Accepted Answer

Rotation of the head to the opposite side

Question 5

Which muscle is the primary muscle of inspiration?

Accepted Answer

Diaphragm

Question 6

A person is unable to flex their forearm at the elbow joint. Which muscle is most likely impaired?

Accepted Answer

Biceps brachii

Question 7

Which group of muscles is responsible for extending the leg at the knee joint?

Accepted Answer

Quadriceps

Question 8

Damage to which muscle would most likely impair the ability to dorsiflex the foot at the ankle joint?

Accepted Answer

Tibialis anterior

Question 9

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

Accepted Answer

Iliopsoas

Question 10

If a person cannot extend their forearm at the elbow, which muscle is most likely damaged?

Accepted Answer

Triceps brachii

Question 11

Which muscle is responsible for elevating the shoulders, such as when shrugging?

Accepted Answer

Trapezius

Question 12

A soccer player tears their hamstring during a sprint. Which movement will be most affected?

Accepted Answer

Flexion of the leg at the knee

Question 13

Which muscle is most involved in puckering the lips, as in whistling?

Accepted Answer

Orbicularis oris

Question 14

Which muscle group is responsible for adducting the thigh at the hip joint?

Accepted Answer

Adductors

Question 15

During a biceps curl, which muscle acts as the antagonist?

Accepted Answer

Triceps brachii

Question 16

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

Accepted Answer

Gluteus maximus

Question 17

A patient presents with difficulty exhaling forcefully. Which muscle is most likely weakened?

Accepted Answer

Internal intercostals

Question 18

Which muscle is primarily responsible for flexing the wrist?

Accepted Answer

Flexor carpi radialis

Question 19

Which muscle is most involved in smiling?

Accepted Answer

Zygomaticus major

Question 20

Which muscle is responsible for compressing the abdomen and assisting in forced expiration?

Accepted Answer

Transversus abdominis

Muscles of the Human Body: Classification and Function (Chapter 11 Study Guide)

Study Guide - Practice Questions