Topic: red blood cells

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Oxygen’s surprisingly complex journey through your body

Oxygen forms about 21% of the air around us. In your body, oxygen forms a vital role in the production of energy in most cells. But if gases can only efficiently diffuse across tiny distances, how does oxygen reach th...

How Old Is Your Body, Really?

Have you ever heard the statement that the cells in your body are completely replaced every seven years? Is this true? In this beautifully illustrated episode of Skunk Bear, NPR's Adam Cole explores how long our diffe...

What are those floaty things in your eye? – TED Ed

Have you ever seen something small and strangely transparent float into your field of vision? ...as if it's on your eyeball? No, you're not seeing things! And no, those are not microscopic bugs or bits of dust in ...

Animated Life: Seeing the Invisible

"Everything that you can actually see with your eye is just the smallest sliver of life on this Earth. Most of life is invisible..." And so begins the exquisite paper-puppetry of Seeing the Invisible, a video by F...

Why Red Blood Cells Look Like Donuts

This week, the 5 year old discovered the science videos of Bite Sci-zed’s Alex Dainis, starting with this one: Echinoderm Show & Tell. When he immediately asked for more, we watched The Gas Laws, Dishes and...