Tag: Anatomy

Metabolism & Nutrition, Part 1: Crash Course A&P #36

Metabolism & Nutrition, Part 1: Crash Course A&P #36

I weigh about 80 kilograms. Most of that, let’s say 64 percent, is water — though you can’t tell by looking. I mean, as organisms go, I like to think that I look fairly solid. After water, the next largest proportion of me is protein, about 16% — not just

Immune System, Part 3: Crash Course A&P #47

Immune System, Part 3: Crash Course A&P #47

It is time! We have arrived at the final conflict. The battle royale. A fight to the…well, hopefully not death, but a big fight anyway. It only seems fitting that we spend this, our last episode of anatomy and physiology, talking about one of your body’s last-ditch efforts to defend

Autonomic Nervous System: Crash Course A&P #13

Autonomic Nervous System: Crash Course A&P #13

No matter what you’re a fan of, you can probably think of two characters who fit the description. Holmes and Watson. Brennan and Booth. Kirk and Spock. Ron and Hermione. They’re close. They understand each other in ways that others don’t, and you really can’t picture one without the other.

Vision: Crash Course A&P #18

Vision: Crash Course A&P #18

Take a good long look at this — we’re gonna mess with your brain. This is the first stage of an optical illusion. Many illusions use patterns of light or perspective to exploit the disconnect that exists between sensation and perception — between what your eyes see and what your

Immune System, Part 2: Crash Course A&P #46

Immune System, Part 2: Crash Course A&P #46

What’s true in World of Warcraft is also true in your immune system: To defeat your enemy, you have to know your enemy. Uncover its weaknesses. Learn how to see it, before it sees you. We’ve already talked about how your innate defense system keeps out, or quietly neutralizes, pathogens

Blood Vessels, Part 2: Crash Course A&P #28

Blood Vessels, Part 2: Crash Course A&P #28

Why is everybody so worried about high blood pressure? I mean, of all of the millions of things that could go fatally wrong in your body at any given moment, it doesn’t seem like the biggest threat you face is that your blood might be pumping a little too hard.

Respiratory System, Part 1: Crash Course A&P #31

Respiratory System, Part 1: Crash Course A&P #31

Let me introduce you to one of the bravest pioneers in the history of life on planet Earth. An organism that blazed the trail for every single vertebrate that lives on land today — and many that don’t. It’s one of your most important ancestors. Meet…well, it doesn’t have a