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Flashcards in Chapter 10 Deck (17):
1

How do skeletal muscles interact with each other?

They work together (adding forces) or opposite to undo each other's movements. They also can only ever pull on bones, they CANNOT push. They pull in a way that the insertion will move towards the origin.

2

What are the 4 functional groups of skeletal muscle?

1. Prime Mover (agonist)
2. Antagonist
3. Synergist
4. Fixators

3

What is the function of a "prime mover"?

Provides the most force for a particular action

4

What is the function of a "antagonist"?

opposes or reverses a particular action

5

What is the function of a "synergists"?

Muscle that are "on", or contracting, together. Help prime movers or reduce undesirable movement's

6

What is the function of a "fixator"?

synergists that immobilize a bone

7

How are skeletal muscles named?

1. Location
2. Shape
3. Size (maximus/ minimus, longus/brevis are examples
4. Direction of the fibers: transverse, oblique, rectus
5. # of origins- how many heads form the origin
6. Location of the attachments
7. Action the muscle will perform
8. Any combination of the above

8

Name the 5 fascicle arrangements

Circular
Convergent
Parallel
Fusiform
Pinnate

9

Describe a "circular" fascicle arrangement

usually a round muscle with fibers in a circular pattern

10

Describe a "convergent" fascicle arrangement

fibers start at a broad origin and run to a common point

11

Describe a "parallel" fascicle arrangement

fibers running in the same direction along a long, strap-like muscle

12

Describe a "fusiform" fascicle arrangement

fibers running in the same direction along a long muscle with a thicker middle portion.

13

Describe a "pinnate" fascicle arrangement

obliquely running fibers, uni- one set, bi- two sets, multi- three or more sets

14

What are the three components of a lever system?

Lever
Fulcrum
Force

15

Describe the "lever" in a lever system.

Bar that rotates around a point (fulcrum): our bones

16

Describe the "fulcrum" in a lever system

point in which the lever rotates about: our joints

17

Describe the "force" in the lever system

Effort- force that provides the movement: our muscles
Load- mass being moved- our body mass and potentially an external object