Question 1

Which of the following best describes the functional advantage of pennate muscles compared to parallel muscles?

Accepted Answer

Pennate muscles develop more tension because they contain more myofibrils per unit area.

Question 2

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

Accepted Answer

Rectus femoris

Question 3

Which class of lever is represented by the action of the triceps brachii during elbow extension?

Accepted Answer

First-class lever

Question 4

If a muscle is named 'flexor carpi radialis,' what can you infer about its action and location?

Accepted Answer

It flexes the wrist and is located on the radial side of the forearm.

Question 5

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

Accepted Answer

Deltoid

Question 6

A muscle that assists the agonist by preventing movement at another joint is called a:

Accepted Answer

Fixator

Question 7

Which of the following muscles is an example of a circular muscle and what is its primary function?

Accepted Answer

Orbicularis oris; acts as a valve to close the mouth opening

Question 8

Which muscle group is primarily responsible for plantar flexion at the ankle during activities such as standing on tiptoe?

Accepted Answer

Gastrocnemius and soleus

Question 9

A muscle named 'biceps femoris' indicates which of the following characteristics?

Accepted Answer

It has two heads and is located in the thigh.

Question 10

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

Accepted Answer

They maximize speed and distance of movement at the expense of force.

Question 11

During a biceps curl, which muscle acts as the antagonist?

Accepted Answer

Triceps brachii

Question 12

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

Accepted Answer

Teres major

Question 13

Which muscle is responsible for flexion and adduction at the shoulder joint?

Accepted Answer

Coracobrachialis

Question 14

A patient has difficulty moving food across their teeth and creating suction for nursing. Which muscle is most likely impaired?

Accepted Answer

Buccinator

Question 15

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

Accepted Answer

Turns the head obliquely to the opposite side

Question 16

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

Accepted Answer

Quadriceps femoris

Question 17

Which of the following muscles is a major flexor of the forearm and also supinates the forearm?

Accepted Answer

Biceps brachii

Question 18

Which muscle is responsible for producing lateral rotation at the shoulder joint?

Accepted Answer

Infraspinatus

Question 19

Which of the following is a function of the muscles of the pelvic floor?

Accepted Answer

Control movement of materials through the urethra and anus

Question 20

Which system delivers oxygen and nutrients to the muscular system and removes carbon dioxide during exercise?

Accepted Answer

Cardiovascular system

The Muscular System: Structure, Function, and Organization

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