The Human

1
The Human Body
Created by Bethany Eggman for EDTE 232
2
Nervous System
Respiratory System
Five Senses
Skeletal System
Digestive System
Reproductive System
Circulatory System
CLICK ON ANY BUTTON TO LEARN ABOUT THE HUMAN BODY
3

• Nervous System
• The adult human brain weighs between
• 1300 g and 1400 g (approximately 3 lbs).
• The Automatic Nervous System is most
• important in two situations
• 1. In emergencies that cause stress and require
• us to "fight" or take "flight" (run away) and
• 2. In non-emergencies that allow us to "rest"
• and "digest.

4
The Digestive System
The digestive system is a series of hollow
organs joined in a long, twisting tube from the
mouth to the anus.
Digestion involves the mixing of food, its
movement through the digestive tract, and
chemical breakdown of the large molecules of
food into smaller molecules.
Our food and drink must be changed into smaller
molecules of nutrients before they can be
absorbed into the blood and carried to cells
throughout the body.
5
The Circulatory System The heart beats around 3
billion times in the average person's life.
About 8 million blood cells die in the human
body every second, and the same number are born
each second. Within a tiny droplet of blood,
there are some 5 million red blood cells, 300
000 platelets and 10 000 white cells. It takes
about 20 seconds for a red blood cell to circle
the whole body. Red blood cells make
approximately 250,000 round trips of the body
before returning to the bone marrow, where they
were born, to die. Red blood cells may live
for about 4 months circulating throughout the
body, feeding the 60 trillion other body cells
6
The Respiratory System
The primary function of the respiratory system is
to supply the blood with oxygen in order for the
blood to deliver oxygen to all parts of the body.
The respiratory system does this through
breathing. When we breathe, we inhale oxygen and
exhale carbon dioxide. This exchange of gases is
the respiratory system's means of getting oxygen
to the blood.

• Your lungs contain almost 1500 miles of airways
  and over
• 300 million alveoli.
• Every minute you breathe in 13 pints of air.
• Plants are our partners in breathing. We breathe
  in air,
• use the oxygen in it, and release carbon dioxide.
  Plants
• take in carbon dioxide and release oxygen. Thank
  goodness!

7

• The Skeletal System
• The average human adult skeleton has 206 bones.
• The skeleton plays an important part in movement
  by providing a series of independently movable
  levers, which the muscles can pull to move
  different parts of the body.
• It supports and protects the internal body
  organs.
• The bones are also a storehouse for minerals.
• Babies are born with 270 soft bones.

8
The Reproductive System
Everybody has them, but not many people talk
about them. Some people call them their
"privates," and others just kind of blush and
whisper, "down there." But the truth is that
your reproductive parts aren't any weirder or any
more cause for embarrassment than say, your feet
or your eyes - it's just that they're covered up
most of the time. The reproductive system gets
its name from the fact that its parts allow a
person to reproduce, or have a child.
9
The Five Senses
Smell
Touch
Sight
Taste
Hearing
10
Web Links
The virtual body
A Look Inside the Human Body
Innerbody.com
Life Science Connections