1. Introduction to the Muscular System

2. http://www.youtube.com/watch?v=Rs WNyqnHQ2I

3. Muscle Types Skeletal – Moves bones Smooth – moves internal organs Cardiac – moves heart

4. Skeletal Muscles Enable movement by pulling bones Made mostly of proteins Striated – lines or stripes on tissue that make it strong and enable it to contract Exert large forces for a short period of time Strong but get tired easily Voluntary

5. Skeletal Muscle types Flexors and extensors - work in opposing pairs - one contracts and the other relaxes - responsible for gross motor movement like dancing, walking, - responsible for fine motor movement like writing, painting, playing video games

6. Skeletal Muscle Types Levators and Depressors - levator = lifting - depressors = bringing back down

7. Muscle pairs

8. http://health.howstuffworks.com/human- body/systems/musculoskeletal/adam- 200006.htm

9. Smooth Muscle Not striated Apply weaker forces Have great endurance – can work for a long period of time without a lot of rest – digestion can take up to 8 hours! Involuntary Found in the internal organs – digestive organs and blood vessels

10. Cardiac Muscle Some striations Found ONLY IN THE HEART! Strong force and great endurance Continuously working!!!

11. All Muscle Cells Must Rest!