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  • KidsHealth presents, 'How The Body Works',

  • 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.

KidsHealth presents, 'How The Body Works',

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B2 US olfactory nasal air smell sneeze unwanted

How Your Nose Works

  • 30 1
    Amy.Lin posted on 2019/03/18
Video vocabulary