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).
Science Videos. Science Main Index. Capillaries are the smallest blood vessels in the body. They allow water, oxygen, carbon dioxide, and other nutrient and waste substances to exchange between blood and surrounding tissues. Read on to learn more about capillaries, and what they do in your body.cience Videos. Science Main Index. Capillaries are the smallest blood vessels in the body. They allow water, oxygen, carbon dioxide, and other nutrient and waste substances to exchange between blood and surrounding tissues. Read on to learn more about capillaries, and what they do in your body.