Question 1

Which of the following best describes the arrangement of muscle fibers in a parallel muscle such as the biceps brachii?

Accepted Answer

Fibers are parallel to the long axis of the muscle, allowing the muscle to shorten and increase in diameter during contraction.

Question 2

A patient is unable to pucker their lips, making it difficult to whistle. Which muscle is most likely affected?

Accepted Answer

Orbicularis oris

Question 3

Which muscle type is characterized by fibers that are concentrically arranged around an opening, and what is a real-life example of its function?

Accepted Answer

Circular muscle; closing the mouth

Question 4

During a bench press, the pectoralis major muscle is primarily responsible for moving the arms toward the midline of the body. What type of muscle organization does the pectoralis major exhibit?

Accepted Answer

Convergent

Question 5

Which of the following best explains why convergent muscles, such as the pectoralis major, are considered versatile?

Accepted Answer

Different portions of the muscle can contract independently, allowing for variation in the direction of pull.

Question 6

A muscle with fibers that form a common angle with the tendon, such as the deltoid, is classified as which type of muscle?

Accepted Answer

Pennate

Question 7

If a muscle is named 'biceps brachii,' what does the prefix 'bi-' indicate about its structure?

Accepted Answer

It has two origins.

Question 8

Which of the following best describes the function of an antagonist muscle during movement?

Accepted Answer

It opposes the action of the agonist, producing movement in the opposite direction.

Question 9

A muscle named 'extensor digitorum' is likely to have which of the following actions?

Accepted Answer

Extends the fingers

Question 10

Which connective tissue layer surrounds a fascicle within a skeletal muscle?

Accepted Answer

Perimysium

Question 11

During a biceps curl, which muscle acts as the prime mover (agonist)?

Accepted Answer

Biceps brachii

Question 12

Which of the following muscle names indicates its location and the direction of its fibers?

Accepted Answer

Rectus abdominis

Question 13

A muscle that assists the prime mover in performing its action is called a:

Accepted Answer

Synergist

Question 14

Which of the following best describes the action of a circular muscle (sphincter) such as the external anal sphincter?

Accepted Answer

It decreases the diameter of an opening when contracted.

Question 15

If a muscle is named 'adductor longus,' what does the term 'adductor' indicate about its function?

Accepted Answer

It moves a limb toward the midline of the body.

Question 16

Which of the following equations best represents the relationship between muscle force ($F$), cross-sectional area ($A$), and muscle tension ($T$)?

Accepted Answer

$F = T 	imes A$

Question 17

A muscle with a broad origin and fibers converging to a single tendon is best suited for which of the following?

Accepted Answer

Allowing different portions to contract independently for versatile movement

Question 18

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

Accepted Answer

Deltoid

Question 19

If a muscle is named 'sternocleidomastoid,' what does this name indicate about its attachments?

Accepted Answer

It attaches to the sternum, clavicle, and mastoid process.

Question 20

Which of the following best explains why pennate muscles, such as the rectus femoris, can generate more force than parallel muscles of the same size?

Accepted Answer

Pennate muscles have more fibers packed into a given area, increasing the total cross-sectional area and force.

The Muscular System: Classification and Organization of Skeletal Muscles

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