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Unit 19: Biology Part 2 Page 79 of 137
Lesson 6: Diseases
and Defenses
Infectious Diseases
Wash your hands! Cover your
mouth when you cough! Toss your
tissues after you’ve used them!
Figure 65: A person having a
seizure is not able to control Do these sound familiar to you? If
their body.
you’ve heard these pieces of
advice, consider yourself lucky.
Although it is not possible to
prevent all diseases of the nervous The person who was telling you to
system, there are steps you can do these things was trying to keep
take to minimize your risk. you, and those around you,
healthy.
Eeating a variety of healthy foods
and exercising regularly. Of By doing simple things like
course, if your exercise includes covering your cough and washing
biking or some other activity that your hands, you can help keep
could lead to a head injury, be sure yourself from getting or spreading
to wear a helmet so you don’t diseases that are infectious, or
damage your nervous system while able to be spread from one person
you are trying to keep it in good to another. Taking these
condition. preventative measures is
important, but if you do get sick,
Just the act of using your brain can your body has ways of fighting off
help make sure that it stays diseases as well.
healthy. Doing crossword puzzles,
reading, and playing musical What Causes Infectious
instruments have all been shown to Diseases?
help keep your brain active and
healthy. You may have heard that diseases
are caused by germs. That’s true,
but “germ” is not a scientific term.
The word pathogen is the
scientific way of saying “germ,”
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