Transcript Muscle Powerpoint

Muscular System
There are about 600 muscles in
your body.
Muscle Control
Involuntary Muscle: Not under
conscious control.
Heart beat, digestion
Voluntary Muscle: Under your
control.
Walking, jumping, etc.
3 Types of Muscle
Skeletal
Smooth
Cardiac
Skeletal Muscle
Attached to bones of the skeleton.
Voluntary
Striated(lines)
Smooth Muscle
Inside many internal organs
Involuntary
Not striated
Cardiac Muscle
Heart
Involuntary
Striated
Does not get
tired
Muscles at Work
Skeletal muscles work in pairs.
One muscle contracts
The other lengthens
Skin
Functions
Regulates body temperature
Stores water and fat
The largest organ
sensory organ
Prevents water loss Prevents entry of
bacteria
Layers of Skin
Epidermis – the thin outer layer of skin
that sheds
Dermis – the middle thick layercontains sweat glands, nerves, and
blood vessels
Subcutaneous – the deepest layer that
contains fat and helps protect body
from injury and conserve heat
Facts About Skin
An adult has more than 20 square feet
of skin – about the size of a blanket.
You shed about 40 pounds in a lifetime.
 Every minutes 30,000 to 40,000 dead
skin cells fall from your body.
Facts About Skin
In a month time your body has made a
new layer of skin
There are over a million dust mites on
your mattress and pillow chomping on
dead skin cells that fell off you last
night.
The eyelid has the thinnest skin, the
palms and soles are the thickest.
Parts of the Skin