medical Definition of organelle : a specialized cellular part (as a mitochondrion or nucleus) that has a specific function and is considered analogous to an organ Learn More about organelle
RBCs take up oxygen in the lungs or gills and release it into tissues while squeezing through the body's capillaries. The cytoplasm of erythrocytes is rich in hemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the red color of the cells.ed blood cells are also known as RBCs, red cells, red blood corpuscles (an archaic term), haematids, erythroid cells or erythrocytes (from Greek erythros for red and kytos for hollow vessel, with-cyte translated as cell in modern usage).
Any disruption of the red blood cells, its quantity, shape, size, structure or life cycle can therefore affect the oxygen-carrying capacity of the blood. Functions of Red Blood Cells Apart from carrying oxygen, which is the main function of red blood cell, it can also conduct the following functions. 1  Release the enzyme carbonic anhydrase which allows water in the blood to carry carbon dioxide to the lungs where it is expelled. 2  Control the pH of the blood by acting as an acid-base buffer.