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Body
Systems
The
human body is the most wonderful, complex machine
in the world. Your body can walk and run, climb
and sit. It can see, hear, smell, taste, and
feel. It can eat, talk, laugh, lift things,
play games, think, and read. While these things
are going on, you are breathing; there is blood
flowing through your blood vessels; you are
digesting food; and your body is doing a million
other jobs at the same time! All through your
life this marvelous machine is at work-even
when you are sleeping.
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These
functions are performed by the various body
systems:
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The
:
Your circulatory system is make up of your heart,
arteries, veins, and very thin blood vessels called
capillaries. |
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The
:
The endocrine system produces chemical messengers
called hormones which help to control other body
functions. |
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The
:
Oxygen enters your body through your nose or mouth,
moves down your windpipe and into your lungs.
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The
: Almost
half the body's weight is muscle. Muscles are
the part of our body that allow us to move. |
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The
: Your mouth, esophagus, stomach, large and small
intestines and other organs make up your digestive
system. |
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The
: provides
shape and form of our bodies, supports, protects,
and allows bodily movement; it also produces blood
for the body, and stores minerals. |
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The
: Your
brain, your spinal cord, and the millions of nerve
cells in your body make up your nervous system.
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The
:
The excretory system is responsible for the elimination
of wastes produced by homeostasis. |
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The
:
The body's immune system includes several kinds
of white cells in blood, body fluids, and lymph
nodes. |
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The
:
All living things, including humans, reproduce;
it's one of the things that set us apart from
nonliving matter. |
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