Chapter 11 (The Muscular System II)

Question 1

Effects of muscle fascicle arrangement

Answer 1

All muscle fibers are parallel to one another within a single fascicle.
Fascicles, however, form patterns with respect to the tendons.

Question 2

Patterns formed by fascicles

Answer 2

Parallel
Fusiform
Circular
Triangular
Pennate

Question 3

Muscle fascicles must compromise

Answer 3

Between power and range of motion

Question 4

The longer the fibers in a muscle

Answer 4

The greater the range of motion it can produce.

Question 5

The power of a muscle depends

Answer 5

On its total cross-sectional area.

Question 6

Coordination among muscles

Answer 6

Muscles do not work in isolation

Movements usually result from several skeletal muscles acting as a group

Question 7

Antagonistic Pairs

Answer 7

Most skeletal muscles at joints are arranged in opposing pairs. These can be Agonists or Antagonists.
Example: Flexors vs. Extensors

Question 8

Agonist (Prime Mover)

Answer 8

Responsible for the action

Question 9

Antagonist

Answer 9

Stretches and yields to the effects of the agonist

Question 10

Synergists

Answer 10

Contract and stabilize the intermediate joints
Prevent unwanted movements at other joints
Aid the movement of the agonist

Question 11

Fixators

Answer 11

Stabilize the origin of the agonist so that they act more efficiently