1. 4.2.1 MUSCLE RULES REVIEW
QUIZ NEXT CLASS

2. Types of Muscle There are 3 types of muscle in our bodies Skeletal
Smooth
Cardiac
Each has different characteristics

4. Skeletal Muscle Voluntary – we control the movement
Striated – looks like long fibers
Linked to bones by tendons
Function – to help us move / move our bones

5. Skeletal Muscle

6. Smooth Muscle Involuntary Action – controlled by our CNS Non-striated
Found in arteries, veins, intestines, etc.
Function : Maintain organ dimensions – stretch and recoil

7. Smooth Muscle

8. Cardiac Muscle Involuntary Striated – but, may
be branched which is unlike skeletal muscle.
Found in walls of the heart
Function : To pump the heart!!!!
Highly resistant to fatigue w/ lots of mitochondria

9. Cardiac Muscle

10. MUSCLE RULE #1
Muscles must have at least two attachments and must cross at least one joint

11. Muscles always “pull” and get shorter.
MUSCLE RULE #2
Muscles always “pull” and get shorter.

12. MUSCLE RULE #3
The attachment that moves is known as the insertion and the attachment that remains stationary is known as the origin.

13. MUSCLE RULE #4
Muscles that decrease the angle between ventral surfaces of the body are known as flexors. Muscles that increase the angle between ventral surfaces of the body are known as extensors

14. MUSCLE RULE #5
Muscles work in opposing pairs.

15. Muscle striations point to the attachment & show direction of pull
MUSCLE RULE #6
Muscle striations point to the attachment & show direction of pull
Muscle striations point to the attachments and show the direction of pull.

16. Naming Skeletal Muscles
1 – Location of the muscle 2 – Shape of the muscle 3 – Size of the muscle 4 – Direction/Orientation of the muscle fibers/cells 5 – Number of Origins 6 – Location of the Attachments 7 – Action of the muscle