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. Muscular system
There are more than 630 muscles in your body. On average, your body weight is 40% muscle.
Muscles consists of million of fibers packed with protein. Not all proteins are identified yet.

5. The Amazing Muscle
The job of a muscle is to move the body. Without muscles the skeleton couldn’t move. Muscle help to move the mouth to form speech, help to blink, digest food, breathe, pump the heart and allow a person to smile.

6. Functions of the Muscular System
Produce movement
Maintain posture and body position
Support soft tissue
Guard entrances and exits
Maintain body temperature

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

8. Muscle Groups
Each muscle belongs to one of three categories: Skeletal muscles, Smooth muscle, and cardiac muscle.

9. Three types of muscle
Skeletal
Cardiac
Smooth

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

11. 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

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

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

14. Skeletal muscle action produces movements at synovial joints
Skeletal muscle action produces movements at synovial joints. Usually one end of the muscle is attached to a relatively immovable or fixed on side of a joint, while the other end of the muscle is attached to a movable end or origin.

15. Types of body movement Flexor Extensor Abduction Adduction
Hyperextension
Dorsiflexion
Rotation
circumduction
Let’s look at each one

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

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

18. Abduction-moving of a body part away from the central axis of the body .
Adduction-moving of a body part toward the central axis of the body.

19. Hyperextension-Extension of a bodily joint beyond its normal range of motion.

20. Dorsiflexion-the act of bending backward (of the body or a body part

21. Rotation-The act or process of turning around a center or an axis.

22. Circumduction-The circular movement of a limb.

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

25. Of muscular system, now let’s look at the skin.
The End
Of muscular system, now let’s look at the skin.