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THE MUSCULAR SYSTEM

THE MUSCULAR SYSTEM . Introduction . Our bodies have over 600 muscles, which make up half of our body weight Muscles are used to eat, talk, walk etc Muscles burn lots of calories when they are being used and when resting Muscles burn even more calories when they are “in shape”.

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THE MUSCULAR SYSTEM

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  1. THE MUSCULAR SYSTEM

  2. Introduction • Our bodies have over 600 muscles, which make up half of our body weight • Muscles are used to eat, talk, walk etc • Muscles burn lots of calories when they are being used and when resting • Muscles burn even more calories when they are “in shape”

  3. MAJOR MUSCLE TYPES SMOOTH MUSCLE: • Involuntary and contract automatically • CNS adjusts contraction as required • They do not tire easily and can stay contracted for long periods of time Ex. Esophagus, stomach, blood vessels

  4. MAJOR MUSCLE TYPES CARDIAC MUSCLE • Specialized muscle tissue that comprises the heart • Involuntary

  5. MAJOR MUSCLE TYPES SKELETAL MUSCLES: • Connect to bones by tendons • Voluntary – you control them • The engines that pull on bones – causing joints to move

  6. MUSCLES IN ACTION… Muscles work through a process called contraction. Muscle Contraction – result of filaments deep within the muscle sliding over each other This process occurs simultaneously over entire muscle fibre – resulting in contraction

  7. SLIDING FILAMENT THEORY Sequence for contraction: • Electrical impulse comes from brain (voluntary) or spinal cord (involuntary) • Signal travels along nerve to muscle site (neuromuscular junction) and attempts to jump the gap.

  8. SLIDING FILAMENT THEORY • Chemical reaction takes place deep within the muscle fibre • The reaction causes the filaments to “slide” over one another. Thin filament (actin) slide past the thick filament (myosin) • Muscle fibre contracts. http://www.youtube.com/watch?v=EdHzKYDxrKc

  9. Types of Muscle Contraction • CONCENTRIC – muscle shortens while working • ECCENTRIC – muscle lengthens while working • ISOMETRIC – no change in length. Force = resistance.

  10. ANATOMY DIAGRAM • Complete the chart and diagram

  11. Instructions Now that you’ve taken a look at the muscular system, you will take a quick look at the path of blood in our system. We discussed this briefly yesterday, but you will need the following information for a unit test. Mr. Ceccarelli

  12. Pulmonary Circulation Systemic Circulation Path of Blood

  13. Veins and Arteries • Veins transport blood TO the heart • Arteries  transport blood AWAY from the heart

  14. Pulmonary Circulation • circulation of blood between the heart and the lungs • Deoxygenated blood (blue) becomes oxygenated (red)

  15. Path of Deoxygenated Blood

  16. Path of Deoxygenated Blood

  17. Systemic Circulation • circulation of blood between the heart and the body • From the lungs Oxygenated blood returns to the heart through the Pulmonary Veins

  18. Path of OxygenatedBlood

  19. Path of OxygenatedBlood

  20. Instructions For the grand finale……

  21. Lactic Acid??? • Read p 49 and describe Lactic acid and how it forms and discuss how it affects the body. • This may make a great test question…..

  22. Final Note: • This now concludes our programming for today – thanks for watching!!! • Remember to get your rock climbing form and money in for Monday AND to bring in money for St. Michael feast day next Thursday. • You can now put down your pencils and take a deep breathe – health is over…… for now….. Have a great weekend. • Mr. C!

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