for EDTE 232
Nervous System Respiratory System
Digestive System Skeletal System
Circulatory System Reproductive System
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THE HUMAN BODY
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"
The Digestive System
The digestive system is
a series of hollow organs
joined in a long, twisting
tube from the mouth to the
Digestion involves the mixing
of food, its movement through
Our food and drink must the digestive tract, and
be changed into smaller chemical breakdown of the
molecules of nutrients before large molecules of food into
they can be absorbed into smaller molecules.
the blood and carried to
cells throughout the body.
The Circulatory System
The heart beats around 3 billion times in the average
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
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
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!
The Skeletal System
•The average human adult skeleton has 206
•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
• The bones are also a storehouse for minerals.
• Babies are born with 270 soft bones.
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.
The Five Senses
The virtual body
A Look Inside the Human Body
Life Science Connections