Draw a conclusion about the structural features of human and frog erythrocytes.

Draw a conclusion about the structural features of human and frog erythrocytes. How can you explain the lack of a nucleus in human erythrocytes?

Human erythrocytes have the shape of a biconcave disc due to the absence of a nucleus in it. This is due to the fact that a person has pulmonary respiration. Thus, the working surface of the erythrocyte increases (the contact surface of the erythrocyte and oxygen increases, respectively, the erythrocyte carries more oxygen). In a frog, skin respiration and most of the oxygen receives through the skin (oxygen dissolves in the secreted mucus), for this reason, the frog’s erythrocyte has a nucleus, because the frog already receives enough oxygen.