Tension $$= \frac{50\ \text{lb}}{1\ \text{in}^2}$$

Question 1

Which pattern of fascicle organization allows a muscle to develop the greatest tension, and why?

Accepted Answer

Pennate muscles, because they contain more myofibrils per cross-sectional area.

Question 2

A muscle named 'flexor carpi radialis' most likely:

Accepted Answer

Flexes the wrist and is located on the radial side.

Question 3

If a muscle is described as 'bipennate,' what does this indicate about its structure?

Accepted Answer

Its fibers are arranged on both sides of a central tendon.

Question 4

Which lever class is most common in the human body, and what is its mechanical advantage?

Accepted Answer

Third-class lever; maximizes speed and distance traveled.

Question 5

A muscle that acts as a 'synergist' during elbow flexion:

Accepted Answer

Assists the agonist and helps stabilize the origin.

Question 6

Which of the following best describes the origin and insertion of a muscle?

Accepted Answer

Origin is the fixed point of attachment, usually proximal to insertion.

Question 7

A muscle named 'deltoid' is likely named for its:

Accepted Answer

Shape.

Question 8

If a muscle is described as 'externus,' what does this indicate?

Accepted Answer

It is visible at the body surface.

Question 9

Which muscle type is responsible for opening and closing entrances to the body?

Accepted Answer

Circular muscles (sphincters).

Question 10

A muscle named 'gluteus maximus' is likely:

Accepted Answer

The largest muscle in the gluteal region.

Question 11

Which equation best represents the relationship between muscle cross-sectional area and tension developed?

Accepted Answer

Tension $$= \frac{50\ 	ext{lb}}{1\ 	ext{in}^2}$$

Question 12

Which of the following is a real-life example of a first-class lever in the human body?

Accepted Answer

Nodding the head (atlanto-occipital joint).

Question 13

Which muscle group is primarily responsible for positioning the head and spinal column?

Accepted Answer

Axial muscles.

Question 14

A patient with decreased muscle elasticity and increased fibrosis is most likely experiencing:

Accepted Answer

Effects of aging on the muscular system.

Question 15

Which muscle interaction is described when the biceps brachii contracts and the triceps brachii stretches?

Accepted Answer

Agonist-antagonist pair.

Question 16

A muscle named 'rectus abdominis' is named based on:

Accepted Answer

Its fascicle organization.

Question 17

Which of the following best describes the function of appendicular muscles?

Accepted Answer

Move and stabilize the pectoral and pelvic girdles and limbs.

Question 18

If a muscle is named 'triceps brachii,' what does 'triceps' indicate?

Accepted Answer

The muscle has three origins or heads.

Question 19

Which of the following is a characteristic of convergent muscles?

Accepted Answer

Fibers converge from a broad area onto a single attachment site.

Question 20

A muscle named 'teres minor' is likely:

Accepted Answer

Long and round, but smaller than other teres muscles.

A&P: lecture exam part 2

Study Guide - Practice Questions