Muscular system
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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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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

Function: Movement


Function body temperature
Function: Body Temperature

  • HOMEOSTASIS: Muscle contraction releases heat to keep your body the right temperature

  • Shivers: fast muscle contractions to raise body temperature


Function maintain posture

Most muscles always hold a little bit of contraction/tension

Tension = “muscle tone”

Keep you standing up straight (posture)

Function: Maintain Posture


Types of muscle

Skeletal Muscle

Smooth Muscle

Cardiac Muscle

Skeletal = you control it (called VOLUNTARY)

Smooth/Cardiac = you don’t control it (called INVOLUNTARY)

Types of Muscle


Skeletal muscle

Attached to your skeleton

Voluntary

Structure = bundles of fibers

Examples: quadriceps, biceps, triceps, abs, etc.

Skeletal Muscle



Smooth muscle
Smooth Muscle

  • Inside organs

  • Involuntary (automatic movements)

  • Shorter fibers than skeletal muscle

  • Example: pushes food through stomach and intestines


Cardiac muscle
Cardiac Muscle

  • Fibers have branched shape (like tree branches) that form webs and layers

  • Make up the heart <3




Tendons
Tendons

  • Attach muscles to bones

  • White skinny part of muscle

  • “Gristle”


Muscles and exercise
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


Skeletal muscle development

Skeletal muscles “mature” and strengthen as you grow up

Increase coordination

Babies can’t lift head (neck muscles still weak)

Skeletal Muscle Development