PATHOLOGY

Detailed explanation-1: -– Unlike the rest of the cells in your body, your red blood cells lack nuclei. That quirk dates back to the time when mammals began to evolve. Other vertebrates such as fish, reptiles and birds have red cells that contain nuclei that are inactive.

Detailed explanation-2: -The lack of a nucleus increases the surface area-volume ratio of RBCs, thus increasing the area for oxygen absorption.

Detailed explanation-3: -Mature mammalian red blood cells and platelets lack a nucleus whereas white blood cells contain a nucleus.

Detailed explanation-4: -They lack a cell nucleus and organelles, to accommodate maximum space for hemoglobin; they can be viewed as sacks of hemoglobin, with a plasma membrane as the sack. Approximately 2.4 million new erythrocytes are produced per second in human adults.