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

Question 1

Which of the following is NOT a primary function of the muscular system?

Accepted Answer

Synthesizing hormones

Question 2

Skeletal muscles only pull and never push. What is the anatomical reason for this?

Accepted Answer

Muscle fibers can only contract, shortening the muscle

Question 3

When a skeletal muscle contracts, which direction does the insertion move?

Accepted Answer

Toward the origin

Question 4

Which functional group of muscles is responsible for providing the major force for producing a specific movement?

Accepted Answer

Prime movers

Question 5

Synergists in muscle action serve to:

Accepted Answer

Add force to a movement and reduce unnecessary movement

Question 6

Which factor does NOT contribute to muscle force and speed?

Accepted Answer

Bone density

Question 7

A muscle with fascicles arranged in a parallel fashion will have:

Accepted Answer

Maximum shortening

Question 8

Which fascicle arrangement is best suited for generating maximum power?

Accepted Answer

Pennate

Question 9

In a lever system, what does the fulcrum represent in the human body?

Accepted Answer

The joint

Question 10

Which type of lever system allows a small effort over a large distance to move a large load over a small distance?

Accepted Answer

Second class lever

Question 11

A third class lever in the body is characterized by:

Accepted Answer

The effort being between the fulcrum and load

Question 12

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

Accepted Answer

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

Question 13

Which muscle group acts to immobilize a bone or muscle’s origin during movement?

Accepted Answer

Fixators

Question 14

If a muscle is arranged in a circular fascicle pattern, what is its likely function?

Accepted Answer

Opening and closing an orifice

Question 15

Which of the following best describes the role of antagonists in muscle movement?

Accepted Answer

They oppose or reverse a particular movement

Question 16

A muscle with a pennate fascicle arrangement is most likely to:

Accepted Answer

Generate high power over a small range of motion

Question 17

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 18

Which muscle arrangement allows for the greatest range of motion?

Accepted Answer

Parallel

Question 19

What is the main advantage of a lever system in the musculoskeletal system?

Accepted Answer

It enables a given effort to move a heavier load or move a load farther/faster

Question 20

Which of the following statements about muscle mechanics is correct?

Accepted Answer

Muscle speed is determined by fiber type and lever system

Muscular System: Structure, Function, and Mechanics

Study Guide - Practice Questions