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Gah! Cavity Sam here is not doing so great.
He's got junk in his body that definitely

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should not be there. But, you know, like the
fork and the knife in the belly and the heartburn

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and the jackhammer head are easy problems
to fix because Sam's body does not come close

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to the incredible complexity of what's going
on inside of you right now.

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Your body is awesome, literally. The amount
of stuff going on at any given time to keep

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you alive and functioning is awe-inspiring.
Trying to manipulate the tiny little tweezers

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so you can retrieve the nail from poor Sam's
fingers is nothing compared to the challenge

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of just trying to understand the systems that
keep you operating. The human body is composed

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of thousands of intricate pieces of biological
machinery, which is part of why we rely on

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two twin disciplines to talk about it here
on Crash Course: anatomy and physiology. Anatomy

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is the study of the structure and relationships
between body parts, while physiology is the

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science of how those parts come together to
function and keep that body alive.

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From grave robbers to microscopes, these fascinating
disciplines have come a long way and we are

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still discovering new things about how it
all works. I'm not going to lie to you, it's

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tough. We'll build on things that you learned
in biology and chemistry and you'll learn

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more about cell specialization, how your epithelial
tissue creates order out of the mayhem of

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your body, and look at the important protection
you get from your integumentary system. And

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by the end of this course you're gonna understand
more about all of the complicated things your

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body is up to right now while you're sitting
there at home watching this video, and maybe

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you'll appreciate what a wondrous thing that
body of yours truly is.

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To be clear, that is not a real x-ray.

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It's Photoshop.

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So join us for a new year of Crash Course
where I, Hank Green, talk about all of this...

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stuff and hopefully help us all understand
a little more about ourselves with Crash Course:

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Anatomy and Physiology.

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(Game buzzes) Duhh! Homeostasis.