1. The Muscular System
What do skeletal muscles do?
How do muscles work?

2. The Muscular System
Muscle is an organ that can relax and contract, and provides the force to move your body parts.

3. Tim and Moby film

4. A. Function of Skeletal Muscles
Produce movement
Maintain posture and body position
Support soft tissue
Guard entrances and exits
Maintain body temperature

5. To move or not to move
1.  Voluntary muscles – muscles that you are able to control
2. Involuntary muscles – muscles that you cannot control

6. Three types of muscle
Skeletal
Cardiac
Smooth

7. Skeletal Large muscles Maintain posture
Facilitate (help with) locomotion
Move jointed bones
Joined to bones by tendons

8. Heart muscle cells behave as one unit Found only in the heart
Cardiac muscle
Main muscle of heart
Heart muscle cells behave as one unit
Found only in the heart
Involuntary

9. Found in walls of internal organs Involuntary movement
Smooth muscle
Found in walls of internal organs
Involuntary movement

10. Tendon ~ strong, tough connective tissue cord, connect muscle to bone
Example *Achilles Tendon (attaches to calf muscle and heel bone)

11. Type of muscle movement
Flexor
Extensor
Let’s look at each one

12. Flexion (Flexor) ~ decreasing the angle between two bones and body part

13. Extension ( Extensor) ~ increasing the angle between two bones and body part

15. Do you know who I am? Hint: I’m the governor of Cal.

16. The End