Circulation Station
Follow a drop of blood as your heart pumps it to the lungs to get purified, out to power your whole body, and past the intestine and liver to pick up nutrients and filter out waste.
How your blood gets purified
The whole loop happens in under a minute, over and over, every single day of your life — without you ever thinking about it.
- 1Used blood comes home
After delivering oxygen all over your body, "used" blood — low on oxygen, full of carbon dioxide — flows back into the blue side of your heart.
- 2Heart pumps it to the lungs
The heart squeezes and sends that low-oxygen blood straight up to the lungs to be cleaned.
- 3Lungs purify it
Inside the lungs, blood drops off carbon dioxide (which you breathe out) and soaks up fresh oxygen (which you just breathed in). It turns bright red — oxygen-rich!
- 4Fresh blood returns
Purified, oxygen-rich blood flows back down into the red side of the heart, ready to go to work.
- 5Heart pumps it to the body
The heart gives its biggest squeeze here, pushing oxygen-rich blood all the way out to your brain, muscles, and every organ.
- 6Your gut adds nutrients
Meanwhile, your small intestine breaks down the food you ate and absorbs the nutrients — vitamins, sugars, proteins — straight into your bloodstream.
- 7The liver processes it
That nutrient-rich blood passes through the liver next, which stores some nutrients for later, balances what's left, and filters out toxins and waste — like a cleaning-and-stocking station.
- 8The cycle repeats
Every cell — in your brain, muscles, skin, and toes — grabs the oxygen and nutrients it needs to grow, move, and heal. The blood turns low-oxygen again and heads back to the heart — the whole loop starts over.
A single drop of blood makes the entire round trip — heart → lungs → heart → whole body → liver → heart — in about one minute, and your heart repeats this roughly 100,000 times a day.