Why Do Human Red Blood Cells Lack a Nucleus but Have a Cell Membrane?

💡 The Answer

• The biconcave shape of red blood cells is maintained by the membrane cytoskeleton.
• Losing the nucleus frees space for hemoglobin, but the membrane remains essential.
• The ruptured membrane causes hemolysis, releasing hemoglobin into plasma.
• Enucleation in mammals allows more flexible deformation through narrow capillaries.