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).
All three are types of blood vessels. Arteries carry freshly-oxygenated blood away from the heart and supply it to organs and other parts of the body that need oxygen. Veins carry oxygen-depleted blood back to the heart.Capillaries are tiny blood vessels that branch off from arteries and veins, and that most closely interact with tissue to supply oxygen to them (or carry oxygen-depleted blood away from them).Mark H Â· 9 years ago.eins carry oxygen-depleted blood back to the heart. Capillaries are tiny blood vessels that branch off from arteries and veins, and that most closely interact with tissue to supply oxygen to them (or carry oxygen-depleted blood away from them). Mark H Â· 9 years ago.