Question 1

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

Accepted Answer

It assists the prime mover by adding force or reducing unnecessary movements.

Question 2

A patient is unable to flex their knee after a sports injury. Which muscle group is most likely affected?

Accepted Answer

Hamstrings

Question 3

Which lever class is represented by the action of the triceps brachii during elbow extension, and what is the anatomical arrangement?

Accepted Answer

First-class lever; fulcrum between load and effort

Question 4

The sternocleidomastoid (SCM) muscle originates from which anatomical structures?

Accepted Answer

Clavicle and sternum

Question 5

Which muscle is primarily responsible for dorsiflexion of the foot?

Accepted Answer

Tibialis anterior

Question 6

During inhalation, which muscle contracts to increase the volume of the thoracic cavity?

Accepted Answer

Diaphragm

Question 7

Which muscle group is composed of the supraspinatus, infraspinatus, teres minor, and subscapularis?

Accepted Answer

Rotator cuff

Question 8

A patient presents with difficulty closing their lips tightly. Which muscle is most likely impaired?

Accepted Answer

Orbicularis oris

Question 9

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

Accepted Answer

Biceps femoris

Question 10

The gastrocnemius muscle inserts onto which structure?

Accepted Answer

Calcaneus via the Achilles tendon

Question 11

Which muscle is responsible for compressing the cheeks during actions such as blowing or sucking?

Accepted Answer

Buccinator

Question 12

In a third-class lever system, such as the action of the biceps brachii during elbow flexion, where is the effort applied relative to the fulcrum and load?

Accepted Answer

Effort is between the fulcrum and the load

Question 13

Which muscle is known as the most powerful muscle in the human body based on force production?

Accepted Answer

Gluteus maximus

Question 14

A fixator muscle functions to:

Accepted Answer

Stabilize the origin of the prime mover

Question 15

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

Accepted Answer

Standing on tiptoe (plantar flexion)

Question 16

The sartorius muscle is unique because it:

Accepted Answer

Is the longest muscle in the body and allows for crossing the legs

Question 17

Which muscle contracts during forced exhalation to decrease the volume of the thoracic cavity?

Accepted Answer

Internal intercostals

Question 18

If the origin of the sternocleidomastoid is fixed and the insertion moves, what action occurs?

Accepted Answer

Rotation and flexion of the head

Question 19

Which of the following muscles is NOT part of the hamstring group?

Accepted Answer

Rectus femoris

Question 20

A patient with a rotator cuff injury is most likely to have damage to which muscle?

Accepted Answer

Supraspinatus

Chapter 10: Muscle Function, Lever Systems, and Major Muscles of the Human Body

Study Guide - Practice Questions

Study Guide - Flashcards