Muscular System

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  • 1. Muscular System Life Science, Ms. Wells
  • 2. Function: Movement
    • 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
  • 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. Function: Maintain Posture
    • Most muscles always hold a little bit of contraction/tension
    • Tension = “muscle tone”
    • Keep you standing up straight (posture)
  • 5. Types of Muscle
    • Skeletal Muscle
    • Smooth Muscle
    • Cardiac Muscle
    • Skeletal = you control it (called VOLUNTARY)
    • Smooth/Cardiac = you don’t control it (called INVOLUNTARY)
  • 6. Skeletal Muscle
    • Attached to your skeleton
    • Voluntary
    • Structure = bundles of fibers
    • Examples: quadriceps, biceps, triceps, abs, etc.
  • 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 Muscle Development
    • Skeletal muscles “mature” and strengthen as you grow up
      • Increase coordination
    • Babies can’t lift head (neck muscles still weak)
  • 15. THE END