Which cells are bi-concave and lack a nucleus?

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Multiple Choice

Which cells are bi-concave and lack a nucleus?

Explanation:
Bi-concave and enucleated describes mature red blood cells in mammals. The bi-concave shape increases the surface area-to-volume ratio, speeding gas exchange (oxygen in, carbon dioxide out). At the same time, removing the nucleus during development frees space for hemoglobin, the molecule that carries oxygen. Other cell types have nuclei and different shapes—nerve cells have nuclei and extend long processes; muscle cells are elongated and often multinucleated; epithelial cells form layers and also contain nuclei. So the cells that fit both features—bi-concave and lacking a nucleus—are red blood cells.

Bi-concave and enucleated describes mature red blood cells in mammals. The bi-concave shape increases the surface area-to-volume ratio, speeding gas exchange (oxygen in, carbon dioxide out). At the same time, removing the nucleus during development frees space for hemoglobin, the molecule that carries oxygen. Other cell types have nuclei and different shapes—nerve cells have nuclei and extend long processes; muscle cells are elongated and often multinucleated; epithelial cells form layers and also contain nuclei. So the cells that fit both features—bi-concave and lacking a nucleus—are red blood cells.

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