Title: Muscles
1Muscles
2 Function a. Muscles contract or
shorten b. Provide motility c. Move
substances through body- heart, blood
vessels digestion
3FUNCTIONS d. Muscle tone - maintains posture
keeps organs in place e. Muscles generate
heat when worked
4Types of muscles
1. Skeletal - Attached to bone a.
Voluntary b. Striated c. Multinuclei d.
Bundled cells e. Movement of body parts
52. Smooth - internal organs
a. Involuntary b. Not striated c. Only 1 nucleus
per cell d. Regulates other systems
6Ex. Peristalsis moves food through digestive
system
73. Cardiac - found only in heart
a. Striated b. Involuntary c. Can contract
without nervous stimluation
8d. Contracts relaxes continuously
Does not fatigue!
9Movement
1. Occurs when shortened 2. Work In pairs
a. Flexor - muscle that flexes bone
b. Extensor - muscle that
extends bone
103. Tendons hold muscle to bone
11Sliding Filament Theory
Muscles made of 2 filaments (actin myosin)
that slide over one another when they contract.
12Sliding Filament Theory
Myosin
Actin
Relaxed
Contracted
13Caring for your muscles
1. Stretch before after exercise lactic acid
can build up and cause soreness possible
injury 2. Without adequate exercise, muscles
will atrophy.
14Caring for your muscles
3. Without proper nutrition, muscles may spasm
or become strained