Wähle von der Dropdown-Liste, um den Text zu vervollständigen.
Red Blood cells are made of ( Hemoglobin, Platelets ) which is iron coloring the blood red when in contact with ( Carbon dioxide, Carbon monoxide, Oxygen, Dihyrdogen Monoxide ). They are also ( biconcave, concave, round, large ) to increases greater surface area for gas exchange and ( small, enucleated, flexable ) in order to accommodate maximum space for hemoglobin.