with Chloe and the Nurb.

So Nurb, what's the quest?

Something remarkable.

Gad-zooks, that sounds terrific.

Why, look, there it is!

The nose!

That's it?

I was expecting something a little more impressive.

More impressive than the nose?

Hah!

Not likely.

Enlighten me.

Where to start?

How about the entrance?

At the entrance of the nose, you'll

find there are two holes called nostrils.

They're separated by something called a septum.

When you breathe in through the nostrils,

the air enters the nasal passage and heads

into your nasal cavity.

The nasal cavity is a space in your head behind your nose.

From the nasal cavity, the air heads downhill,

through the trachea, or windpipe, and poof --

ends up in the lung.

Then the whole process happens in reverse when you exhale.

Breathing's great and all, but I can also

breathe through my mouth.

The nose is a lot more than a hole to breathe through.

It also warms, moistens, and filters the air

before it enters the lungs.

How does it warm, moisten, and filter the air?

I'm glad you asked.

The inside of the nose is lined with a moist, thin layer

of tissue, called a mucous membrane, which makes

mucus, that sticky stuff in your nose.

Oh.

You mean snot?

Wonderful, glorious snot works with your nose hairs

to capture dust, germs, and other small particles that

could irritate your lung.

When the mucus, dirt, and other debris dry and clump together,

voila -- you've got yourself a booger.

So a booger is like a trophy your nose captures when

it's protecting your lungs?

Nose trophy!

Oh, sweet rightness.

Now, sometimes, your nose captures

something it needs to get rid of right now.

Hey!

Stop putting that pepper on your sandwich.

You're going to make it--

Ah-- achoo!

Sneeze.

A sneeze shoots unwanted particles out of your nose

at up to 100 miles an hour!

Who are you calling an unwanted particle?

Air in, air out.

Warms, moistens, and filters the air on the way, makes boogers,

can shoot unwanted stuff out your nose

at 100 miles per hour.

Pretty awesome stuff.

Oh, but wait.

There's more!

Close your eyes.

What?

Just do it.

Smell.

Mm, fresh bread.

Smell.

Orange -- nice.

Smell.

Aw, a rose.

You shouldn't have.

Smell.

Ew, gross!

Your old gym socks?

You really shouldn't have.

Your nose can smell what it smells because

of the olfactory epithelium.

Olfactory is a fancy word for things

that have to do with smelling.

The olfactory epithelium contains special receptors

that notice them.

Then the receptors send signals along the olfactory nerve

to the olfactory bulb.

Those signals then go to the all important brain.

So that's how I know if I'm smelling bread,

an orange, a rose.

Exactly.

Or say, your old, smelly sock?

Wow, the nose.

The nose!

We salute you.

Two thumbs up for the nose.

For the nose, not in it.

Yeah, I get that now.

Can we go on the sneeze ride again?

That was awesome.

Just as soon as I get my thumbs out.