1. Post Muscle Contraction
This simple process occurs in just a few thousandths of a second!!!
Summary New Summary:McGraw Hill
PROJECT TIME!!!
Student Example
Beth Dietzen: Prezi
Sam B photostory

3. Contraction of a Skeletal Muscle
“all or none”
Different combinations
Force
Need for ATP

4. What causes muscle cells to relax?
Botulism
Snake Venom
Rigor Mortis
Muscular Dystrophy
Myasthenis Gravis

5. 3 pathways to get ATP (diagram p 190)
Bonds of ATP
4-6 seconds
1. Direct phosphorylation of ADP to ATP
- Creatine phosphate (CP) - converts ADP to ATP directly
Aerobic respiration occurs in mitochondria
3. Anaerobic respiration fast but not as efficient as aerobic

6. Muscle Fatigue and Oxygen Debt “Why do you get tired when you workout
Muscle fatigue: (Video: Olympic Games)
Used Oxygen must be “repaid”

7. Muscle Tone and Exercise
Muscle strains/tears

10. What is muscle fatigue and what are some causes of muscle fatigue?
What is a muscle cramp? Causes?

12. Aerobic Exercise Effects of Exercise on Muscle
Fast twitch (more CP) and slow twitch fibers (more mitochondria)
Small increase in muscle cell size
Store more oxygen
More Increase flexibility, mitochondria, coordination
Resist fatigue

13. Resistance Exercise Effects of exercise on muscle
Isometric
Increase connective tissue
Increase muscle cell size (myosin) and strength
More contractile filaments

14. Both types together are BEST
Results of increased muscle use:
Increase in muscle strength and efficiency
Muscle becomes more fatigue resistant
Healthy heart (enlarges)
improves digestion
bones stronger
lungs more efficient
clear fat deposits from walls of blood vessels