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Muscular System

Muscular System. Work with skeletal system to move body contract = shorten/tighten Muscles PULL bones, never push muscle cells are called muscle fibers Often work in pairs/groups for one movement. Function: Movement. Function: Body Temperature.

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Muscular System

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  1. Muscular System

  2. Work with skeletal system to move body contract = shorten/tighten Muscles PULL bones, never push muscle cells are called muscle fibers Often work in pairs/groups for one movement Function: Movement

  3. Function: Body Temperature • HOMEOSTASIS: Muscle contraction releases heat to keep your body the right temperature • Shivers: fast muscle contractions to raise body temperature

  4. Most muscles always hold a little bit of contraction/tension Tension = “muscle tone” Keep you standing up straight (posture) Function: Maintain Posture

  5. Skeletal Muscle Smooth Muscle Cardiac Muscle Skeletal = you control it (called VOLUNTARY) Smooth/Cardiac = you don’t control it (called INVOLUNTARY) Types of Muscle

  6. Attached to your skeleton Voluntary Structure = bundles of fibers Examples: quadriceps, biceps, triceps, abs, etc. Skeletal Muscle

  7. Skeletal Muscle: Bundles of Fibers

  8. Smooth Muscle • Inside organs • Involuntary (automatic movements) • Shorter fibers than skeletal muscle • Example: pushes food through stomach and intestines

  9. Cardiac Muscle • Fibers have branched shape (like tree branches) that form webs and layers • Make up the heart <3

  10. Cardiac Muscle: Branched Fibers

  11. Muscle Types: Fiber Shapes

  12. Tendons • Attach muscles to bones • White skinny part of muscle • “Gristle”

  13. Muscles and Exercise • Soreness DURING exercise: chemicals build-up as you use up energy (lactic acid) • Soreness AFTER exercise: tears and damage to muscle fibers • Healing and replacement of damaged cells = muscle growth

  14. Skeletal muscles “mature” and strengthen as you grow up Increase coordination Babies can’t lift head (neck muscles still weak) Skeletal Muscle Development

  15. THE END

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