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There are different types of blood cells. Red blood cells, which I assume you mean, are made of a molecule called haemoglobin in a protein shell. Haemoglobin binds with oxygen to become Oxyhaemoglobin, allowing red blood cells to transport oxygen around the body.

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12y ago
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11y ago

they are made of a sponge like substance and they are very bendy to fit through small spaces

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9y ago

red blood cells are cells that have oxygen. Having high red blood cell counts can be caused by anemia and a sign of other conditions.

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11y ago

structural protein and hemoglobin

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Q: What causes red blood cells to be made?
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