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The Muscular System

The Muscular System. 1. The main function of the muscular system is to work with our skeletal system to help us move. How many muscles are there in your body?. 2. There are about 600 muscles in your body. Involuntary.

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The Muscular System

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  1. The Muscular System

  2. 1. The main function of the muscular system is to work with our skeletalsystem to help us move.

  3. How many muscles are there in your body? 2. There are about 600muscles in your body.

  4. Involuntary 3. Muscles that are NOT under your conscious control are called involuntarymuscles. • Involuntary muscles are responsible for activities such as breathingand digesting food.

  5. Voluntary 5. The muscles that are under your control ARE voluntarymuscles. • Smilingand turning the pages in a book are actions of voluntary muscles.

  6. 6. Three Types of Muscles • Skeletal muscles (striated) • Smooth • Cardiac

  7. 6.Skeletal Muscles • Voluntary • Attach to bones by tendons • Work in pairs • As one muscle relaxes, the other contracts • Cells are long and thin • Cells have striped appearance (striated) • React quickly, but tire quickly

  8. 7.Smooth Muscles • Involuntary • Muscles of internalorgans (stomach and intestine) • Cells are smaller and shorter • Cells are arranged in compact layers • React slowly, but do not tire.

  9. 8.Cardiac Muscles • Found only in the heart • Has characteristics of bothskeletal and smooth muscles • Cells are striped and arranged in bundles (skeletal) • Cells are shorter and involuntary • Never tire

  10. 9. How do muscles work? • Muscles work by contracting, or becoming shorterand thicker. • Because muscle cells can onlycontract, not extend, skeletal muscles must work in pairs. • While one muscle contracts, the other muscle in the pair returnsto its originallength.

  11. Muscles in Action • To bend the elbow, the biceps muscle on the front of the upper arm contracts, while the triceps muscle on the back of the upper arm returns to its original length.

  12. Muscle Health • Exercise is important for maintaining muscular strength and flexibility. • Exercise makes individual muscle cells grow wider, thicker and stronger.

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