Question 1

Which connective tissue layer directly surrounds each individual skeletal muscle fiber?

Accepted Answer

Endomysium

Question 2

A patient presents with difficulty raising their arm overhead after a fall. Imaging reveals a tear in one of the rotator cuff muscles. Which muscle is most likely affected if the patient cannot initiate abduction of the arm?

Accepted Answer

Supraspinatus

Question 3

Which of the following best describes the role of a synergist muscle during movement?

Accepted Answer

It assists the agonist by stabilizing joints and minimizing unwanted movement.

Question 4

Which muscle is primarily responsible for flexing the forearm at the elbow joint?

Accepted Answer

Brachialis

Question 5

A runner experiences pain in the posterior lower leg after sprinting. Examination reveals tenderness at the calcaneal tendon. Which muscle group is most likely involved?

Accepted Answer

Triceps surae

Question 6

Which of the following muscles is NOT part of the quadriceps femoris group?

Accepted Answer

Biceps femoris

Question 7

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

Accepted Answer

Rectus femoris

Question 8

A patient is unable to dorsiflex their foot after a nerve injury. Which muscle is most likely paralyzed?

Accepted Answer

Tibialis anterior

Question 9

Which of the following best describes the anatomical term 'origin' of a muscle?

Accepted Answer

The stationary anchoring point of the muscle on a bone

Question 10

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

Accepted Answer

Masseter

Question 11

Which muscle is most important for plantar flexion of the foot during walking or running?

Accepted Answer

Gastrocnemius

Question 12

Which of the following muscles is responsible for facial expression such as smiling?

Accepted Answer

Zygomaticus major

Question 13

A patient with poor posture and a sedentary lifestyle develops painful muscle knots in the upper back. Which of the following is a recommended prevention strategy?

Accepted Answer

Engage in moderate exercise and maintain a healthy diet

Question 14

Which muscle is the main abductor of the thigh at the hip joint?

Accepted Answer

Gluteus medius

Question 15

Which muscle is primarily responsible for flexion of the wrist?

Accepted Answer

Flexor carpi radialis

Question 16

Which of the following is a function of skeletal muscle contraction that is NOT directly related to movement?

Accepted Answer

Generating heat for body temperature regulation

Question 17

Which muscle is most likely to be injured in a person who experiences pain and weakness when attempting to throw a baseball overhead?

Accepted Answer

Supraspinatus

Question 18

Which muscle is responsible for compressing the abdominal contents and increasing intra-abdominal pressure?

Accepted Answer

Transversus abdominis

Question 19

A patient is unable to extend their forearm at the elbow after an injury. Which muscle is most likely damaged?

Accepted Answer

Triceps brachii

Question 20

Which muscle is most important for controlling the opening and closing of the mouth during eating and speaking?

Accepted Answer

Orbicularis oris

The Muscular System: Structure, Function, and Major Muscles

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