Question 1

Which muscle is primarily responsible for the abduction of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 2

A patient presents with difficulty extending their forearm at the elbow. Which muscle is most likely impaired?

Accepted Answer

Triceps brachii

Question 3

Which muscle group is primarily responsible for maintaining posture and extending the vertebral column?

Accepted Answer

Erector spinae muscles

Question 4

During a tennis match, a player experiences pain in the lateral side of the forearm near the elbow. Which muscle is most likely involved?

Accepted Answer

Extensor carpi radialis longus

Question 5

Which muscle is the primary flexor of the hip joint?

Accepted Answer

Iliopsoas

Question 6

A person is unable to dorsiflex their foot after a leg injury. Which muscle is most likely damaged?

Accepted Answer

Tibialis anterior

Question 7

Which muscle is responsible for closing the eyelids?

Accepted Answer

Orbicularis oculi

Question 8

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

Accepted Answer

Teres major

Question 9

A patient has difficulty flexing their fingers. Which nerve is most likely affected?

Accepted Answer

Median nerve

Question 10

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

Accepted Answer

Gastrocnemius

Question 11

Which muscle is responsible for the elevation of the scapula, such as when shrugging the shoulders?

Accepted Answer

Trapezius

Question 12

A person is unable to extend their wrist and fingers after a humeral fracture. Which nerve is most likely injured?

Accepted Answer

Radial nerve

Question 13

Which muscle forms the bulk of the calf and is involved in standing on tiptoe?

Accepted Answer

Gastrocnemius

Question 14

Which muscle is the primary adductor of the thigh?

Accepted Answer

Adductor longus

Question 15

Which muscle is responsible for flexion of the forearm at the elbow joint?

Accepted Answer

Biceps brachii

Question 16

Which muscle is primarily responsible for the movement of the mandible during chewing?

Accepted Answer

Masseter

Question 17

Which muscle is responsible for the extension of the leg at the knee joint?

Accepted Answer

Rectus femoris

Question 18

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

Accepted Answer

Gluteus medius

Question 19

Which muscle is responsible for the flexion of the trunk, such as when performing a sit-up?

Accepted Answer

Rectus abdominis

Question 20

Which muscle is responsible for the opposition of the thumb?

Accepted Answer

Opponens pollicis

The Muscular System: Structure and Function

Study Guide - Practice Questions