Q: Which of the following equations best represents the mechanical advantage of a lever system?

$$ \text{Mechanical Advantage} = \frac{\text{Length of effort arm}}{\text{Length of load arm}} $$

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 stabilizing the joint and reducing unnecessary movement.

Question 2

A muscle named 'flexor carpi radialis' is named based on which of the following criteria? Select all that apply.

Accepted Answer

Action, location of attachment, and location

Question 3

Which fascicle arrangement allows for the greatest range of motion but the least power generation?

Accepted Answer

Parallel

Question 4

During a jumping movement, the quadriceps femoris acts as the prime mover for knee extension. Which muscle group acts as the antagonist in this action?

Accepted Answer

Hamstrings

Question 5

A muscle with fascicles that insert into both sides of a central tendon, forming a feather-like pattern, is classified as:

Accepted Answer

Bipennate

Question 6

Which of the following statements about levers in the human body is correct?

Accepted Answer

A power lever allows a small effort to move a large load a short distance.

Question 7

The sternocleidomastoid muscle is named for its:

Accepted Answer

Attachment sites

Question 8

If a muscle’s insertion is located farther from the joint (fulcrum) than its origin, what is the likely effect on the muscle’s action?

Accepted Answer

It will act as a power lever, requiring less effort to move a larger load.

Question 9

Which muscle is an example of a muscle named for its shape?

Accepted Answer

Deltoid

Question 10

A patient is unable to pucker their lips. Which muscle is most likely impaired?

Accepted Answer

Orbicularis oris

Question 11

Which of the following best describes a fixator muscle?

Accepted Answer

A muscle that immobilizes a bone to provide stability for the action of a prime mover

Question 12

Which of the following muscle names indicates the muscle has three origins?

Accepted Answer

Triceps brachii

Question 13

A muscle with fascicles arranged in concentric rings is classified as:

Accepted Answer

Circular

Question 14

Which of the following is true regarding muscle action and joint movement?

Accepted Answer

Muscles only pull; they never push, and as a muscle shortens, the insertion is pulled toward the origin.

Question 15

Which of the following best explains why pennate muscles can generate more force than parallel muscles of the same size?

Accepted Answer

Pennate muscles have more fibers packed into a given muscle volume, increasing cross-sectional area.

Question 16

A muscle named 'transversus abdominis' is named for which characteristic?

Accepted Answer

Fiber direction

Question 17

Which of the following equations best represents the mechanical advantage of a lever system?

Accepted Answer

$$ 	ext{Mechanical Advantage} = \frac{	ext{Length of effort arm}}{	ext{Length of load arm}} $$

Question 18

A muscle that adducts the thigh is most likely named:

Accepted Answer

Adductor longus

Question 19

Which of the following is an example of a convergent muscle?

Accepted Answer

Pectoralis major

Question 20

If a muscle is named 'gluteus maximus,' what does 'maximus' indicate?

Accepted Answer

It is the largest muscle in the group.

Question 21

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

Accepted Answer

Triceps brachii

The Muscular System: Structure, Function, and Organization

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