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red blood cells
Blood cells exchange carbon dioxide for oxygen. Neither is actually "air", as such.
neuron
Capillaries are very small and only one cell thick to allow O2/CO2 exchange. Nutrients and wastes are also exchanged.
No. They are called alveoli. Lymphocytes are a type of white blood cell.
red blood cells are a type of cell
There is only one normal type of red blood cell.
red blood cell
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red blood cell
Platelet
Red blood cell