1. AIM: Why do we need a Muscular system?

2. DO NOW: Explain how puppets work HW: Identify the 3 types of muscle and provide examples of each

3. Locomotion Movement by contracting (shortening) and relaxing (expanding) muscles The Muscular System A body system of muscles that enable the organism to perform the life activity of

4. Approximately 40% of your body weight is in muscles You have over 630 muscles that move you. Muscles can't push. They pull. Muscles often work in pairs so that they can pull in different or opposite directions.

5. You have over 30 facial muscles Eye muscles are the busiest muscles in the body. Scientists estimate they may move more than 100,000 times a day! The largest muscle in the body is the gluteus maximus muscle in the buttocks.

6. Parts of the Muscular system 1. Muscles organs that contract & relax to move body parts Two types: 1.Voluntary 2.Involuntary

7. Voluntary muscles Muscles that you are able to control Involuntary muscles Muscles that you are NOT able to control

8. 2. Tendons connective tissue that connects muscle to bone

9. Aim: How are our muscles different? Do Now: Read Contractile Obligation and answer these questions HW: textbook page 505 copy and complete

10. 3 Groups of MUSCLES 1. Skeletal Muscle Any muscle that is attached to the skeleton, Voluntary in action

11. Skeletal muscle is striated Striations appears as stripes on the tissue

13. 2. Smooth Muscle Muscle that is found in organs, Involuntary in action

16. 3. Cardiac Muscle Muscle that is found only in the heart, Involuntary in action

17. Contains striations Fibers are branched

20. A B C Aim: How do our muscles work? Do Now:

21. Muscles work by Working in pairs One contracts while the other relaxes

25. How do muscles change Become larger or smaller depending on usage.

26. More exercise causes muscles to be larger in size

27. Less exercise causes muscles to be smaller in size

28. Gregg Valentine Before (@ 20 yrs old)

29. After (Steroid use) 24in arms

30. In the Gym

31. 27in. arms

32. AFTER THEY EXPLODED DUE TO BLOOD CLOTS

33. He went from This to This!

34. Summary

35. How do muscles do “all this work”? Use energy produced from the life process of ________________ The energy is produced in the __________________ AEROBIC RESPIRATION MITOCHONDRIA

36. Why do our muscles get tired?

37. If you run out of oxygen your body temporarily switches to Anaerobic Respiration called fermentation Which produces lactic acid Lactic acid build up causes muscle fatigue/ muscle cramping

38. Muscle Fatigue