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Unit 19: Biology Part 2 Page 70 of 137
division. The sensory division It is tempting to say that your nose
carries messages from the sense and eyes “told” you about the
organs and internal organs to the cookies, but this is not actually
CNS. Human senses include sight, correct. Although your nose
smell, taste, touch, smell, and detects chemicals coming from the
balance. cookies, and your eyes detect light
that bounce off the cookies, all
Other animals have senses we these sense organs can do is send
don’t have. Sharks can sense a a message about what they
mild electric current and birds can sensed. The brain then has the job
sense magnetism, allowing them to of interpreting these messages,
find their way like a hiker with a trying to make sense of them.
compass. Each sense organ is associated
with a certain region of the brain
Every sense we have has a sense that interprets its messages.
organ associated with it. For
example, our eyes are associated The motor division of the PNS
with sight. The optic nerve travels carries messages from the CNS to
from the eye to the brain, sending the internal organs and muscles.
messages. The motor division is further
divided into two parts called the
somatic nervous system and
autonomic nervous system. The
somatic nervous system is in
charge of voluntary movements, or
movements over which you have
control. If you play soccer, your
eyes send a message to your brain
each time you see the ball coming.
Figure 54 – The optic nerve Your somatic nervous system is
sends messages from the eye then responsible for kicking the
to the brain. ball. Your brain sends a message
to your leg instructing it to kick the
Imagine you get home and smell ball.
something delicious. You think you
know the smell, but just to be
sure, you peek into the oven and
see chocolate chip cookies baking.
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