$$Effort \times Effort\ Arm = Load \times Load\ Arm$$

Question 1

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

Accepted Answer

It assists the prime mover by adding extra force and reducing unnecessary movement.

Question 2

A muscle that crosses on the anterior side of a joint typically produces which movement at the shoulder joint?

Accepted Answer

Flexion

Question 3

Which fascicle arrangement allows for the greatest range of motion but is generally the least powerful?

Accepted Answer

Parallel

Question 4

In a second-class lever system, such as standing on tiptoe, what is the correct order of the components from the heel to the toes?

Accepted Answer

Fulcrum, Load, Effort

Question 5

Which muscle is the prime mover for arm abduction at the shoulder joint?

Accepted Answer

Deltoid

Question 6

A patient is unable to voluntarily control urination. Which muscle is most likely impaired?

Accepted Answer

External urethral sphincter

Question 7

Which of the following muscle names indicates the muscle has two origins and is located in the arm?

Accepted Answer

Biceps brachii

Question 8

During chewing, which muscle is primarily responsible for closing the jaw?

Accepted Answer

Temporalis

Question 9

Which equation correctly represents the law of levers as applied to muscle action?

Accepted Answer

$$Effort 	imes Effort\ Arm = Load 	imes Load\ Arm$$

Question 10

A muscle that crosses the lateral side of a joint will most likely produce which movement?

Accepted Answer

Abduction

Question 11

Which muscle arrangement is best suited for producing the most powerful contractions?

Accepted Answer

Multipennate

Question 12

If the effort is applied closer to the fulcrum than the load, what type of lever is this and what is its mechanical advantage?

Accepted Answer

Third-class lever; mechanical disadvantage

Question 13

Which muscle is a fixator that stabilizes the scapula during arm movements?

Accepted Answer

Serratus anterior

Question 14

Which of the following is NOT a criterion used in naming skeletal muscles?

Accepted Answer

Muscle's nerve supply

Question 15

A patient with a paralyzed diaphragm would have difficulty with which process?

Accepted Answer

Inspiration (inhaling)

Question 16

Which muscle is the prime mover for plantar flexion at the ankle joint?

Accepted Answer

Gastrocnemius

Question 17

Which of the following best describes the action of the external intercostal muscles during breathing?

Accepted Answer

They elevate the ribs during inspiration.

Question 18

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

Accepted Answer

Quadriceps femoris

Question 19

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

Accepted Answer

Teres major

Question 20

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

Accepted Answer

Tibialis anterior

The Muscular System: Structure, Function, and Major Muscles

Study Guide - Practice Questions