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Muscular System

Learn how muscles work with the skeletal system to enable body movement through contraction. Explore the functions such as maintaining posture and regulating body temperature. Discover the types of muscles and their roles, including voluntary and involuntary muscles.

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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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