1. MUSCULAR SYSTEM I pp

2. FUNCTION
Support, movement, and protection

3. Types of Muscle

4. TYPES
1. Skeletal Muscle – muscles that move bones (voluntary)

5. TYPES
2. Smooth Muscle – involuntary muscles that protect organs

6. TYPES
3. Cardiac Muscle – involuntary muscles found only in heart

7. MUSCLE STRUCTURE
myofibril muscle cell (fiber)fascicle muscle

9. Muscle Structure
Two types of proteins (actin and myosin) involved

10. Muscle Structure actin filaments anchored to Z line
Sarcomere: functional unit from Z line to Z line

11. MUSCLE CONTRACTION
contraction: shortening of sarcomere between Z –lines

12. MUSCLE CONTRACTION
Myosin “heads” walk along the actin (shortens sarcomere)
Movement of myosin requires ATP

13. MUSCLE FATIGUE
The inability to contract the muscle due to the lack of ATP

14. Body Reacts by… Increasing breathing Increasing heart rate
Increasing production of ATP by breaking down fats