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What makes blood red? What else does blood do?
What is blood type and what does it have to do with our genetics?
How does iron enter your body and where does it go next? It's better to watch this lesson after learning about the small intestine and red blood cells.
A supplement to Follow the Oxygen - how exactly does the mitochondria convert oxygen into energy?
How do we heal? What's the difference between a cut and a bruise?
What does blood pressure mean? How is it measured?
What causes iron overload and what do we do about it?
Why do we love candy but it makes us feel so bad? What's a better way to get our sugar fix?
Where do red blood cells come from and where do they go? And did you know your body has a recycling program?
Where does oxygen go in the body and why do we need it so much?