$$MA = \frac{\text{Effort Arm}}{\text{Load Arm}}$$

Question 1

Which statement best describes the difference between the origin and insertion of a skeletal muscle?

Accepted Answer

The origin is the attachment point that remains stationary during contraction, while the insertion is the point that moves.

Question 2

A patient is unable to flex their forearm at the elbow. Which muscle is most likely impaired?

Accepted Answer

Biceps brachii

Question 3

Which term refers to the muscle that opposes or reverses a particular movement?

Accepted Answer

Antagonist

Question 4

When standing on your toes, which type of lever system is being used by your muscles and bones?

Accepted Answer

Second-class lever

Question 5

Which muscle fascicle arrangement is best suited for producing the greatest range of motion but less power?

Accepted Answer

Parallel

Question 6

A muscle named 'extensor carpi radialis longus' indicates which of the following characteristics?

Accepted Answer

It extends the wrist, is located near the radius, and is long.

Question 7

Which of the following muscles is a sphincter that surrounds an external body opening?

Accepted Answer

Orbicularis oris

Question 8

In a third-class lever system, where is the effort applied relative to the fulcrum and load?

Accepted Answer

Effort is applied between the fulcrum and the load.

Question 9

Which muscle group is primarily responsible for extending the thigh and flexing the leg at the knee?

Accepted Answer

Hamstrings

Question 10

A synergist muscle assists the prime mover by:

Accepted Answer

Providing extra force to the same movement.

Question 11

Which equation best represents the mechanical advantage of a lever system?

Accepted Answer

$$MA = \frac{	ext{Effort Arm}}{	ext{Load Arm}}$$

Question 12

Which muscle arrangement allows for the greatest force production?

Accepted Answer

Pennate

Question 13

During inspiration, which muscle is primarily responsible for enlarging the rib cage?

Accepted Answer

Diaphragm

Question 14

Which of the following is NOT a function of the muscles of the pelvic floor?

Accepted Answer

Flex the thigh at the hip

Question 15

A muscle with fascicles converging toward a single tendon insertion is classified as:

Accepted Answer

Convergent

Question 16

Which muscle is the prime mover for jaw closure and is innervated by cranial nerve V?

Accepted Answer

Masseter

Question 17

If the quadriceps tendon is damaged, which movement would be most affected?

Accepted Answer

Extension of the leg at the knee

Question 18

Which muscle group is responsible for dorsiflexion of the ankle?

Accepted Answer

Anterior compartment muscles

Question 19

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

Accepted Answer

Teres major

Question 20

A muscle named 'biceps brachii' indicates that it:

Accepted Answer

Has two origins and is located in the arm.

The Muscular System: Structure, Function, and Classification (Chapter 10, Objective 6: Part 2)

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