The mature red blood cells of mammals are without nucleus and mitochondria. What does this signify?

Red blood corpuscles

1. Red blood corpuscles are disc-shaped, anucleate cells that contain haemoglobin pigment.
2. Haemoglobin is an iron-containing pigment that binds to oxygen and help in its transport.
3. The mature red blood cells of mammals do not have a nucleus and mitochondria. In such conditions, RBCs can not use oxygen for themselves, thus all the oxygen absorbed by the haemoglobin of RBC is transported to the tissues.
4. In the absence of cell organelles, RBCs become more efficient to carry oxygen as their surface area is increase,