7. SENSE ORGANS
SKIN EYES
Look down at your hands for a Your eyes are at work from
minute. Even though you can't see
anything happening, your the moment you wake up to
epidermis is hard at work. At the the moment you close them
bottom of the epidermis, new skin to go to sleep. They take in
cells are forming. tons of information about the
When the cells are ready, they world around you —
start moving toward the top of
your epidermis. This trip takes shapes, colors, movements, a
about 2 weeks to a month. As nd more. Then they send the
newer cells continue to move up, information to your brain for
older cells near the top die and rise
to the surface of your skin. What processing so the brain knows
you see on your hands (and what's going on outside of
everywhere else on your body) are your body.
really dead skin cells.
8. SENSE ORGANS
NOSE EARS
The nose has two holes The outer ear is called
called nostrils. The nostrils the pinna or auricle (say: or-
ih-kul). This is the part of the
and the nasal passages are ear that people can see. It's
separated by a wall called what people pierce to wear
the septum (say: SEP- earrings and what your friend
tum). Deep inside your whispers into when it's time
nose, close to your skull, for a secret. The main job of
the outer ear is to collect
your septum is made of sounds, whether they're your
very thin pieces of bone. friend's whispers or a barking
dog.
9. TONGUE
Has anyone ever told you that the tongue is a
muscle? Well, that's only partly true: The
tongue is really made up of many groups of
muscles. These muscles run in different
directions to carry out all the tongue's jobs.
