Muscular System
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Transcript of Muscular System
Muscular SystemMuscular SystemLife Science, Ms. WellsLife Science, Ms. Wells
Function: MovementFunction: Movement
Work with skeletal system Work with skeletal system to move bodyto move body
contract = shorten/tightencontract = shorten/tighten Muscles PULL bones, never Muscles PULL bones, never
pushpush muscle cells are called muscle cells are called
muscle fibersmuscle fibers Often work in pairs/groups Often work in pairs/groups
for one movementfor one movement
Function: Body TemperatureFunction: Body Temperature
HOMEOSTASIS: Muscle contraction releases HOMEOSTASIS: Muscle contraction releases heat to keep your body the right temperatureheat to keep your body the right temperature
Shivers: fast muscle contractions to raise body Shivers: fast muscle contractions to raise body temperaturetemperature
Function: Maintain PostureFunction: Maintain Posture
Most muscles always Most muscles always hold a little bit of hold a little bit of contraction/tensioncontraction/tension
Tension = “muscle Tension = “muscle tone”tone”
Keep you standing up Keep you standing up straight (posture)straight (posture)
Types of MuscleTypes of Muscle
1.1. Skeletal MuscleSkeletal Muscle
2.2. Smooth MuscleSmooth Muscle
3.3. Cardiac MuscleCardiac Muscle Skeletal = you control it (called Skeletal = you control it (called
VOLUNTARY)VOLUNTARY) Smooth/Cardiac = you don’t control it Smooth/Cardiac = you don’t control it
(called INVOLUNTARY)(called INVOLUNTARY)
Skeletal MuscleSkeletal Muscle
Attached to your Attached to your skeletonskeleton
VoluntaryVoluntary Structure = Structure = bundles of bundles of
fibersfibers Examples: quadriceps, Examples: quadriceps,
biceps, triceps, abs, etc.biceps, triceps, abs, etc.
Skeletal Muscle: Bundles of FibersSkeletal Muscle: Bundles of Fibers
Smooth MuscleSmooth Muscle
Inside organsInside organs Involuntary (automatic movements)Involuntary (automatic movements) Shorter fibers than skeletal muscleShorter fibers than skeletal muscle Example: pushes food through stomach and Example: pushes food through stomach and
intestinesintestines
Cardiac MuscleCardiac Muscle
Fibers have branched Fibers have branched shape (like tree shape (like tree branches) that form branches) that form webs and layerswebs and layers
Make up the heart <3Make up the heart <3
Cardiac Muscle: Branched FibersCardiac Muscle: Branched Fibers
Muscle Types: Fiber ShapesMuscle Types: Fiber Shapes
TendonsTendons
Attach muscles to bonesAttach muscles to bones White skinny part of muscleWhite skinny part of muscle ““Gristle”Gristle”
Muscles and ExerciseMuscles and Exercise
Soreness DURING exercise: chemicals build-Soreness DURING exercise: chemicals build-up as you use up energy (lactic acid)up as you use up energy (lactic acid)
Soreness AFTER exercise: tears and damage Soreness AFTER exercise: tears and damage to muscle fibersto muscle fibers
Healing and replacement of damaged cells = Healing and replacement of damaged cells = muscle growthmuscle growth
Skeletal Muscle DevelopmentSkeletal Muscle Development
Skeletal muscles Skeletal muscles “mature” and strengthen “mature” and strengthen as you grow upas you grow up Increase coordinationIncrease coordination
Babies can’t lift head Babies can’t lift head (neck muscles still (neck muscles still weak)weak)
THE ENDTHE END