What is this?
Red blood cells are tiny, squishy cells that float in your blood. Their super important job is to carry oxygen from your lungs to every part of your body, like a tiny delivery truck. They also help carry carbon dioxide waste back to your lungs to be breathed out.
Key Parts to Explore
Biconcave Shape
This special flattened-in-the-middle shape helps them squeeze through tiny blood vessels and carry more oxygen.
Hemoglobin
Hemoglobin is a special protein inside the cell that grabs onto oxygen and gives red blood cells their red color.
Cell Membrane
This stretchy outer skin holds all the cell's parts together and controls what goes in and out.
No Nucleus
Unlike most cells, mature red blood cells don't have a nucleus, which makes more space for oxygen-carrying hemoglobin.
Did You Know?
Did you know your body makes about 2 million new red blood cells every single second, replacing older ones that wear out?
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