Crash Course
The Heart, part 1 - Under Pressure: Crash Course A&P
Your heart gets a lot of attention from poets, songwriters, and storytellers, but today Hank's gonna tell you how it really works. The heart's ventricles, atria, and valves create a pump that maintains both high and low pressure to...
Bozeman Science
The Circulatory System
Paul Andersen surveys the circulatory system in humans. He begins with a short discussion of open and closed circulatory systems and 2,3, and 4-chambered hearts. He describes the movement of blood through the human heart and the blood...
Crash Course
Circulatory & Respiratory Systems - CrashCourse Biology
Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, and help make it possible for our bodies to function.
Crash Course
Blood, Part 2 - There Will Be Blood: Crash Course A&P
It's time to start talking about some of the terrible things you can do to your own body, like blood doping. We'll start by explaining the structure and function of your erythrocytes, and of hemoglobin, which they use to carry oxygen....
Crash Course
Blood, Part 1 - True Blood: Crash Course A&P
Now that we've talked about your blood vessels, we're going to zoom in a little closer and talk about your blood itself. We'll start by outlining the basic components of blood -- including erythrocytes, leukocytes, platelets, and plasma...
Bozeman Science
Blood Types
Paul Andersen explains the importance of blood types in blood transfusions. He starts with a brief discussion of blood antigens and antibodies. He describes how the ABO differs from the Rh blood type. He shows you how to solve simple...
SciShow
SciShow: Sugar Compilation
We've compiled our videos about sugar and sweetness here. Enjoy the rush!
Crash Course
The Skeletal System: Crash Course A&P
Today Hank explains the skeletal system and why astronauts Scott Kelly and Mikhail Kornienko are out in space studying it. He talks about the anatomy of the skeletal system, including the flat, short, and irregular bones, and their...
SciShow Kids
How Do Fish Breathe? Animal Science for Kids
Jessi and Squeaks adopted a new fish! They have him all set up in a nice fish tank, but now they have a big question: how do fish breathe underwater?!
Crash Course
Health & Medicine: Crash Course Sociology
Our final unit of Crash Course Sociology is medical sociology. Today we’ll explain what it is and get an overview of the role of society in our notions of health and disease.
TED-Ed
TED-Ed: How blood pressure works - Wilfred Manzano
If you lined up all the blood vessels in your body, they'd be 60 thousand miles long. And every day, they carry the equivalent of over two thousand gallons of blood to the body's tissues. What effect does this pressure have on the walls...
MinuteEarth
Why Is Lyme Disease Getting Worse?
Thanks to the University of Minnesota for sponsoring this video! Lyme disease is spreading like wildfire around the world: here's why. ___________________________________________ If you liked this week’s video, you might also like:...
SciShow
How 18th-Century Medicine Killed George Washington
What killed George Washington? Turns out it was probably related to the bloodletting and other 18th-century medicine his doctors applied.
SciShow
3 Reasons Why Ticks Suck
Find out why these arachnids are among the least B of humanity's BFFs. Yeah, they're blood-sucking parasites, but that's not all of it!
TED-Ed
TED-Ed: How do you know if you have a virus? | Cella Wright
A new virus emerges and spreads like wildfire. In order to contain it, researchers must first collect data about who's been infected. Two main viral testing techniques are critical: one tells you if you have the virus and the other shows...
TED-Ed
TED-Ed: Why is pneumonia so dangerous? | Eve Gaus and Vanessa Ruiz
Every time you breathe, air travels down the trachea, through a series of channels, and then reaches little clusters of air sacs in the lungs. These tiny sacs facilitate a crucial exchange: allowing oxygen from the air we breathe into...
SciShow
New Bacterial Enzymes Could Revolutionize Blood Donations SciShow News
Blood banks need a constant supply of donors to maintain their supply, but some enzymes that are already in our bodies might be able to help!
SciShow
3 Reasons Mosquitoes Suck
Hank gives you at least three reasons to like mosquitoes even less than you do already, and tells you how you can literally decrease world suck by fighting mosquito-borne disease.
SciShow
What Happens If You Don't Take out a Splinter?
Splinters are gross, but you might want to watch this before grabbing the tweezers.
SciShow
Kids and Sugar The SweetandLowdown
If you've heard it once, you've heard it a thousand times: Parents blaming their kids' active behavior on sugar. But is it true? Hank gives you sweet-and-lowdown on the extent to which sugar can and can't affect behavior, in kids and...
SciShow Kids
How to Feel Your Heart Beat
Get to know your body’s most important muscle -- your heart -- and learn how to take your own pulse!
SciShow
The Science of Chocolate
While you unwrap that luscious truffle, let Hank explain the science of chocolate -- where it comes from, what its active ingredient is, and how it works. Also learn the difference between chocolate, cocoa, cacao and coca, so you really...
Bozeman Science
Examples of Natural Selection
Paul Andersen details examples of natural selection in the world. He starts by explaining how changes in global temperatures are causing plants to adapt. He explains how mutations cause changes in phenotype which give organisms varying...
TED-Ed
TED-Ed: What would happen if you didn't drink water? - Mia Nacamulli
Water is essentially everywhere in our world, and the average human is composed of between 55 and 60% water. So what role does water play in our bodies, and how much do we actually need to drink to stay healthy? Mia Nacamulli details the...