1. Muscles

2. The word “striated” means striped
The word “striated” means striped. Skeletal muscle appears striped under a microscope.

3. Skeletal Muscle

4. Skeletal Muscle Structure

5. Skeletal Muscle Structure

6. This model of the muscles uses straws to represent fibers.
Green = endomysium Yellow = perimysium Blue = epimysium

8. Cardiac Muscle

9. Cardiac Muscle
 Intercalated discs

10. Cardiac Muscle

11. Smooth Muscle (2 varieties)

12. Smooth Muscle (2 varieties)

16. Myofilaments (2 types)

19. SLIDING FILAMENT THEORY (MODEL)

20. Actin myosin https://www.youtube.com/watch?v=CepeYFvqmk4

21. Sliding Filament Handout

22. Sliding Filament Handout

23. Cardiac Muscle (Ca)
Over half of the calcium which the cardiac cell uses for contraction originates from outside of the muscle cell.
During relaxation much of the calcium will be pumped out of the cell (rather than back into the endoplasmic reticulum.)
Calcium and sodium ions slowly leak through the membrane
When enough of these ions enter, contraction will occur. 
The faster the ions leak into the cell, the faster the cell will contract