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Muscular system


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Muscular system

  1. 1. MUSCULAR SYSTEM 7 SCIENCE: Wed. Nov. 2
  2. 2. What does the muscular system do? • Muscular system allows you to move and your muscles give your body shape • Works with the skeletal system • Do you know how many muscles are found in your body? – There are more than 600 muscles in your body • Did you know that the number of muscles in your body does not increase but the SIZE of the cell increases instead – If you do not do a lot of exercise with your muscles, your muscles may become smaller and weak
  3. 3. What is a muscle? • An organ that relaxes and contracts to allow your body to move • TWO types: – Voluntary • Arms and legs – Involuntary • Muscles of the heart
  4. 4. Types of muscle tissue • There are 3 types of muscle tissue: – Skeletal = move bones • voluntary – Smooth = move many internal organs like intestines and bladder • involuntary – Cardiac = only in the heart • involuntary
  5. 5. How do we move using our muscles? • Muscles move because there are 2 muscles working together: – One muscle contracts, the other relaxes • Muscles need energy, and when energy is used up, the muscle gets tired and needs to rest Try it! Move your bicep muscle: – CONTRACT: when you bend your arm towards your elbow and the muscle gets larger – RELAX: when you move your arm towards the ground and the muscle flattens