Comparison of human and frog erythrocytes and leukocytes.

The frog erythrocyte differs from human erythrocytes in that it has a nucleus (in a mature state, a human erythrocyte will not have a nucleus) and an oval shape (in humans, it has a biconcave disc).

The human erythrocyte is bright red, not the light pink of a frog. The color of a blood cell depends on the amount of the hemoglobin protein in the cell, which contains iron. A person has more of this protein, so the blood is brighter.

Due to the shape of the frog’s erythrocyte, its large size (up to 22.8 microns in diameter, and in humans it is three times smaller) and its structure, they will move more slowly and transport less gases.

For 1 cubic millimeter of blood, a person has 13 times more erythrocytes.