Muscular System. Function: Movement Work with skeletal system to move body Work with skeletal system to move body contract = shorten/tighten contract.

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  • Slide 1
  • Muscular System
  • Slide 2
  • Function: Movement Work with skeletal system to move body Work with skeletal system to move body contract = shorten/tighten contract = shorten/tighten Muscles PULL bones, never push Muscles PULL bones, never push muscle cells are called muscle fibers muscle cells are called muscle fibers Often work in pairs/groups for one movement Often work in pairs/groups for one movement
  • Slide 3
  • Function: Body Temperature HOMEOSTASIS: Muscle contraction releases heat to keep your body the right temperature HOMEOSTASIS: Muscle contraction releases heat to keep your body the right temperature Shivers: fast muscle contractions to raise body temperature Shivers: fast muscle contractions to raise body temperature
  • Slide 4
  • Function: Maintain Posture Most muscles always hold a little bit of contraction/tension Most muscles always hold a little bit of contraction/tension Tension = muscle tone Tension = muscle tone Keep you standing up straight (posture) Keep you standing up straight (posture)
  • Slide 5
  • Types of Muscle 1. Skeletal Muscle 2. Smooth Muscle 3. Cardiac Muscle Skeletal = you control it (called VOLUNTARY) Skeletal = you control it (called VOLUNTARY) Smooth/Cardiac = you dont control it (called INVOLUNTARY) Smooth/Cardiac = you dont control it (called INVOLUNTARY)
  • Slide 6
  • Skeletal Muscle Attached to your skeleton Attached to your skeleton Voluntary Voluntary Structure = bundles of fibers Structure = bundles of fibers Examples: quadriceps, biceps, triceps, abs, etc. Examples: quadriceps, biceps, triceps, abs, etc.
  • Slide 7
  • Skeletal Muscle: Bundles of Fibers
  • Slide 8
  • Smooth Muscle Inside organs Inside organs Involuntary (automatic movements) Involuntary (automatic movements) Shorter fibers than skeletal muscle Shorter fibers than skeletal muscle Example: pushes food through stomach and intestines Example: pushes food through stomach and intestines
  • Slide 9
  • Cardiac Muscle Fibers have branched shape (like tree branches) that form webs and layers Fibers have branched shape (like tree branches) that form webs and layers Make up the heart

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