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

Question 1

Which of the following best describes the role of a synergist muscle during elbow flexion?

Accepted Answer

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

Question 2

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

Accepted Answer

Flexion

Question 3

Which muscle fascicle arrangement is best suited for generating the greatest power?

Accepted Answer

Multipennate

Question 4

In a third-class lever system, which of the following is the correct arrangement of the elements?

Accepted Answer

Fulcrum - Effort - Load

Question 5

Which of the following muscle names indicates both the location and the action of the muscle?

Accepted Answer

Flexor carpi ulnaris

Question 6

A patient is unable to smile on one side of their face. Which muscle and nerve are most likely affected?

Accepted Answer

Zygomaticus major and facial nerve (cranial nerve VII)

Question 7

Which of the following is an example of a muscle acting as a fixator?

Accepted Answer

Pronator teres stabilizing the wrist during elbow flexion

Question 8

Which lever system always operates at a mechanical advantage and is exemplified by standing on tiptoe?

Accepted Answer

Second-class lever

Question 9

A muscle with fibers running parallel to the long axis of the muscle is best described as:

Accepted Answer

Parallel

Question 10

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

Accepted Answer

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

Question 11

Which muscle is responsible for closing the lips and is used in actions such as kissing and whistling?

Accepted Answer

Orbicularis oris

Question 12

If a muscle crosses the lateral side of a joint, what movement does it typically produce?

Accepted Answer

Abduction

Question 13

Which of the following muscles is a prime mover for arm abduction at the shoulder?

Accepted Answer

Deltoid

Question 14

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

Accepted Answer

Parallel

Question 15

A patient presents with difficulty elevating the hyoid bone during swallowing. Which muscle is most likely impaired?

Accepted Answer

Mylohyoid

Question 16

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

Accepted Answer

Color

Question 17

Which muscle is the antagonist to the biceps brachii during elbow flexion?

Accepted Answer

Triceps brachii

Question 18

Which of the following best describes the action of the orbicularis oculi muscle?

Accepted Answer

Closes the eye, produces blinking and squinting

Question 19

Which muscle group is primarily responsible for thigh extension and knee flexion?

Accepted Answer

Hamstrings

Question 20

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

Accepted Answer

Adduction

The Muscular System: Structure, Function, and Major Muscles

Study Guide - Practice Questions