Question 1

Which of the following best describes the role of a synergist muscle during a bicep curl exercise?

Accepted Answer

It assists the agonist by adding extra force or reducing unnecessary movement.

Question 2

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

Accepted Answer

Biceps brachii

Question 3

Which of the following muscle names indicates its location and action?

Accepted Answer

Flexor carpi radialis

Question 4

In a first-class lever system, such as the action of the neck muscles when nodding the head, which of the following is the correct arrangement?

Accepted Answer

Fulcrum between load and force

Question 5

Which muscle acts as the antagonist during elbow flexion?

Accepted Answer

Triceps brachii

Question 6

A person suffers a spinal injury and cannot extend their vertebral column. Which muscle group is most likely affected?

Accepted Answer

Erector spinae

Question 7

Which of the following best describes a third-class lever in the human body?

Accepted Answer

The force is applied between the fulcrum and the load.

Question 8

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

Accepted Answer

Rectus abdominis

Question 9

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

Accepted Answer

Deltoid

Question 10

A patient presents with difficulty elevating their scapula. Which muscle is most likely weakened?

Accepted Answer

Trapezius

Question 11

Which of the following muscles is correctly matched with its origin and insertion?

Accepted Answer

Biceps brachii: Origin - scapula; Insertion - radius

Question 12

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

Accepted Answer

Tibialis anterior

Question 13

If a muscle acts as a fixator, what is its primary function during movement?

Accepted Answer

To stabilize the origin of the agonist

Question 14

Which of the following is an example of a second-class lever in the human body?

Accepted Answer

Standing on tiptoes using the gastrocnemius muscle

Question 15

A soccer player injures their hamstring group. Which action will be most affected?

Accepted Answer

Flexion of the knee

Question 16

Which muscle is the primary agonist for plantarflexion at the ankle joint?

Accepted Answer

Gastrocnemius

Question 17

Which of the following best describes the action of the sternocleidomastoid muscle?

Accepted Answer

Flexes the neck and rotates the head to the opposite side

Question 18

A patient is unable to adduct their thigh at the hip joint. Which muscle is most likely impaired?

Accepted Answer

Adductor longus

Question 19

Which muscle is responsible for compressing the abdominal contents during forced expiration?

Accepted Answer

Transversus abdominis

Question 20

Which of the following statements about lever systems in the human body is correct?

Accepted Answer

Third-class levers favor speed and range of motion over force.

Chapter 9: The Muscular System – Structure, Function, and Major Muscle Groups

Study Guide - Practice Questions