What are red blood cells? What is the main function? What is the difference in structure of erythrocytes of all vertebrates

What are red blood cells? What is the main function? What is the difference in structure of erythrocytes of all vertebrates in comparison with the class of mammals? What is the significance of these differences for the human body?

Red blood cells are red blood cells. They have a biconcave shape.
The main function is to transport oxygen and carbon dioxide.
In vertebrates, erythrocytes have a nucleus, while in mammalian erythrocytes it is absent.



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