But Why: A Podcast for Curious Kids cover image

Why do we have blood and what does it do?

But Why: A Podcast for Curious Kids

CHAPTER

The Power of Your Heart

Think about a big circle going through your body. The blood in your lungs will pick up the oxygen and as it's then being delivered to all the tissues, it's going through vessels that we call arteries. And so arteries carry oxygenated blood. Then once the blood gets to the muscles or the skin, it's in something we call capillaries. Those capillaries get really, really, really tiny tubes. They're really tiny. And then it delivers the oxygen and it picks up any kind of,. I don't know, your cells are always working and so they produce a waste. Your blood also picks up that waste and takes it with it so that it can take it

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