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The Muscular System

The Muscular System. Human Biology & Health Chapter 2.3 Pages 50-54. Try This :. Sit perfectly still! That means move as little as possible Try not to move a muscle for a full 60 seconds Now relax! What did you notice about this exercise?. Muscle-bound.

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The Muscular System

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  1. The Muscular System Human Biology & Health Chapter 2.3 Pages 50-54

  2. Try This: • Sit perfectly still! • That means move as little as possible • Try not to move a muscle for a full 60 seconds Now relax! • What did you notice about this exercise?

  3. Muscle-bound • There are roughly 600 muscles in your body • Used in every action you take • Chewing, breathing, blinking, smiling, etc.

  4. Muscle Action • Classified according to control • Voluntary: muscles you consciously control • Involuntary: muscles you do NOT consciously control • Heart beating, digestion

  5. Types of Muscles 3 Types • Skeletal • Smooth • Cardiac • Skeletal muscle is connected to your bones • The muscle is connected to bone by Tendons • React quickly but also tire quickly.

  6. Types of Muscles 3 Types • Skeletal • Smooth • Cardiac • Involuntary muscles • Not banded like Skeletal muscles. • React more slowly and therefore tire slowly.

  7. Types of Muscles 3 Types • Skeletal • Smooth • Cardiac • Similar to both Skeletal & Smooth muscles • Involuntary and untiring like smooth • Responds quickly and rapidly.

  8. Muscles at Work • Put your pen at the far edge of your table • Place your hands on your lap • Slowly reach out and pick up your pen • How do you think your muscles ‘moved’ just now?

  9. Muscles at Work • Make a “muscle” • How are your muscles moving now? • What is the lump being made by this motion?

  10. Working in Tandom • Muscles can only contract • They work in pairs: one muscle contracts, the other relaxes • Biceps contract when you flex • Triceps contract when you extend your arm.

  11. Exercise and Stretching • Exercising your muscles makes them stronger • Stretching (after a brief warm-up) helps prepare muscles for activity • Increases range of motion and flexibility

  12. Muscle Injuries • Straininjuries occur when a muscle or Tendontears • “Pulled” muscles • Avoid activity that causes pain in ‘pulled’ area • Ice it (no longer than 15 minutes at a time) • Elevate it to heart level.

  13. Muscle Injuries • Spraininjuries occur when a joint is over-stretched or torn • Ligamentsare tissue that connect bones • Ankle sprain • ACL / MCL knee sprains (Anterior / Medial cruciate ligament)

  14. Star Systems & Galaxies (Ch3.4, p117-120) • Star Systems & Galaxies (Ch3.4, p117-120) Exit Pass • What are the 3 kinds of muscle? • What is the only way muscles can move?

  15. Star Systems & Galaxies (Ch3.4, p117-120) • Star Systems & Galaxies (Ch3.4, p117-120) What to Work On • In your notebook, outline Section 2.4, The Skin • Answer the Review questions for both Section 2.3 (page 54, #s 1-4) and Section 2.4 (page 62, #s 1-3)

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