Microorganisms enter our body wherever we
have holes in our body - eyes, nose, mouth, ears,
& other holes. They can get through our skin
if it has a cut or other injury. There are also
lots of microorganisms on our skin. Our bodies
have more cells from microorganisms than the
number of cells from our own bodies, but the
microorganism cells are usually so small that 1
cell from our body is as big as 1000 microorganism
Microorganisms can enter our body when we
breathe. That's how some diseases are spread
- someone coughs, and the microorganisms in the
air they coughed out go into the air that other
There is a lot of research now about the
microorganisms in our intestines. Scientists are
surprised at how people with different gut
microorganisms can have differences in whether or
not they are overweight.
Most of the microorganisms in our bodies are
useful to us.
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