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Organs work together
in organ systems to carry out major life functions. Organ systems
also interact with each other. |
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Organ Systems |
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In dogs, cats, fish, ferns, and you,
many cells
work together in tissues. Many tissues work
together in
organs. Organs work together in
groups too. An organ system is a group
of
organs and tissues that work together to
carry out a life process.
For instance, the
mouth, stomach, intestines, and other
organs work
together to digest food. |
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Bones
Form a System |
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Each
of your bones is an organ. Together,
about 200 bones make up the skeletal
system. This organ system has several
important jobs. It provides
the body with
a strong support system. Imagine what
life would be
like if you did not have
bones
to help you stand or sit up. You
would
move like wiggling worms!
Another job of the skeletal system is
to
protect internal organs. The skull is
made of several bones that work
together to protect the brain. The rib
cage protects your lungs and
heart.
Bones have other jobs too. |
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Muscles Work as a System |
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Bones
Work
Together |
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This is
a cut-away
view of where the
bone in your leg
meets the bone in
your hip. |
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Muscles
are organs that work together to
move your body. You have about 640
muscles that you control. When you run
or dance, your brain tells
dozens of these
muscles how to work together. In other
cases, muscles work by themselves
without your thinking.
Have you ever shivered in cold weather? Shivering can help
you survive the cold. When you shiver, many muscles are
working together to warm
the body. You do not have to think about shivering for it to happen.
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