Question 1

Which connective tissue layer surrounds an individual skeletal muscle fiber?

Accepted Answer

Endomysium

Question 2

A muscle that assists the agonist by making movement more efficient and reducing risk of injury is called a:

Accepted Answer

Synergist

Question 3

Which of the following best describes a pennate muscle?

Accepted Answer

Fascicles attach obliquely to a central tendon

Question 4

The biceps brachii muscle is an example of which type of lever system in the body?

Accepted Answer

Third-class lever

Question 5

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

Accepted Answer

Biceps brachii

Question 6

A patient is unable to elevate their mandible. Which muscle is most likely impaired?

Accepted Answer

Masseter

Question 7

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

Accepted Answer

Deltoid

Question 8

If the fulcrum is at one end, the load is in the middle, and the force is applied at the other end, which class of lever is this?

Accepted Answer

Second-class lever

Question 9

Which muscle is responsible for compressing the abdominal cavity and is important during forced expiration?

Accepted Answer

Transversus abdominis

Question 10

A muscle that opposes the action of the agonist is called a(n):

Accepted Answer

Antagonist

Question 11

Which muscle group is primarily responsible for extending the leg at the knee joint?

Accepted Answer

Quadriceps femoris group

Question 12

Which of the following muscles is involved in smiling?

Accepted Answer

Zygomaticus major

Question 13

Which muscle is responsible for plantarflexion at the ankle joint?

Accepted Answer

Gastrocnemius

Question 14

Which of the following best describes the function of the diaphragm?

Accepted Answer

Separates the thoracic and abdominal cavities and increases thoracic volume during inspiration

Question 15

A patient has difficulty abducting their arm at the shoulder joint. Which muscle is most likely affected?

Accepted Answer

Deltoid

Question 16

Which muscle is responsible for flexing the thumb?

Accepted Answer

Flexor pollicis longus

Question 17

Which of the following muscles is a powerful extensor of the thigh and is part of the gluteal muscle group?

Accepted Answer

Gluteus maximus

Question 18

Which muscle is responsible for elevating the upper lip to produce a snarl or sneer?

Accepted Answer

Levator labii superioris

Question 19

If a muscle is named 'flexor carpi radialis,' what is its likely action and location?

Accepted Answer

Flexes the wrist on the radial side

Question 20

Which of the following statements about mechanical advantage in lever systems is correct?

Accepted Answer

A lever system that uses a small force to move a large load has mechanical advantage

Chapter 9: The Muscular System – Structured Study Notes

Study Guide - Practice Questions