Question 1

Which of the following best describes the difference between the origin and insertion of a skeletal muscle?

Accepted Answer

The origin is the more stationary attachment, and the insertion is the more mobile attachment.

Question 2

A muscle that assists the prime mover by adding extra force or reducing unwanted movements is called a:

Accepted Answer

Synergist

Question 3

Which lever class is most common in the human body and is characterized by the force being applied between the fulcrum and the load?

Accepted Answer

Third-class lever

Question 4

If a muscle has a bipennate fascicle arrangement, which of the following is true?

Accepted Answer

The muscle fibers insert into a tendon from two sides, resembling a feather.

Question 5

During elbow flexion, which muscle acts as the antagonist?

Accepted Answer

Triceps brachii

Question 6

Which muscle is primarily responsible for elevating the mandible during chewing?

Accepted Answer

Masseter

Question 7

A patient is unable to abduct their arm at the shoulder. Which muscle is most likely impaired?

Accepted Answer

Deltoid

Question 8

Which of the following muscles is involved in forced exhalation by depressing the ribs?

Accepted Answer

Internal intercostals

Question 9

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

Accepted Answer

Erector spinae

Question 10

A muscle that acts to stabilize the origin of the prime mover so that it can act more efficiently is called a:

Accepted Answer

Fixator

Question 11

Which of the following best explains why third-class levers are common in the human body?

Accepted Answer

They allow for a greater range of motion and speed.

Question 12

Which muscle is responsible for opening the eyelid?

Accepted Answer

Levator palpebrae superioris

Question 13

Which muscle is the primary abductor of the thumb?

Accepted Answer

Abductor pollicis brevis

Question 14

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

Accepted Answer

Biceps brachii

Question 15

Which muscle is responsible for plantar flexion of the foot at the ankle and also flexes the leg at the knee?

Accepted Answer

Gastrocnemius

Question 16

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

Accepted Answer

Rectus femoris

Question 17

Which abdominal muscle is primarily responsible for flexing the vertebral column and is also active during forced exhalation?

Accepted Answer

Rectus abdominis

Question 18

If a muscle has a circular fascicle arrangement, what is its likely function?

Accepted Answer

Closing an orifice

Question 19

Which muscle is responsible for elevating the scapula?

Accepted Answer

Levator scapulae

Question 20

A patient has difficulty rotating their head to the opposite side and flexing their neck. Which muscle is most likely affected?

Accepted Answer

Sternocleidomastoid

Muscular System: Structure, Function, and Major Muscle Groups

Study Guide - Practice Questions