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Unit 19: Biology Part 2 Page 33 of 137
in dairy products as well as broccoli
and cabbage. Your skin makes
vitamin D when exposed to
sunlight. Additionally, fish is rich in
vitamin D.
It’s important to get out an
Figure 8 Pivot joint. exercise to maintain a healthy
Human palm. skeletal system. When we exercise
we put stress on our bones and
4. Gliding joints: bones are stimulate them to stay strong.
only allowed to glide over Exercising also keeps the muscles
one another. For example the which work with the bones strong.
joint that allows you to flex Just remember to stretch and wear
your wrist. all the appropriate safety gear!
Keeping the skeletal Lastly, if an injury occurs—a bone
system healthy breaks or a ligament tears, for
example—it’s important to see a
The keys to keeping the skeletal medical professional as soon as
system healthy are: possible. Otherwise, the skeletal
system may not heal properly.
Eating well.
Getting exercise. The Muscular System
Taking care of injuries to the
skeletal system. What do our muscles do—and how
do they do it? How many types of
Eating a good balanced diet is very muscles do we have? How do we
important for overall health, but take care of them? These are the
making sure to get specific questions we’ll answer in this
nutrients help ensure a healthy section.
skeletal system throughout your
life! Those nutrients are: calcium Our muscular system helps us
and vitamin D. 1300mg of Calcium move, and helps keep us alive. Our
is recommended (one cup of milk muscles are involved in actions we
has about 300mg of Calcium) and decide to do (kicking a ball, for
200IU of vitamin D (31/2 ounces of example) as well as actions we do
cooked salmon is about 360IU of without thinking about (like
vitamin D). Calcium can be found digesting food). There are three
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