Fill in the Blanks Human systemsOnline version Human systems functions by Sheyris Rodríguez 1 hemoglobin lungs erythrocyte hemoglobin bleeding injuries nucleus color disease oxygen biconcave defends infection nucleus nucleus antibodies leukocyte - Red Blood Cells ( RBCs ) : also called , cellular component of blood , millions of which in the circulation of vertebrates give the blood its characteristic and carry from the to the tissues . The mature human red blood cell is small , round , and ; it appears dumbbell - shaped in profile . The cell is flexible and assumes a bell shape as it passes through extremely small blood vessels . It is covered with a membrane composed of lipids and proteins , lacks a , and contains ? a red , iron - rich protein that binds oxygen . - White Blood Cells ( WBCs ) : also called or white corpuscle , a cellular component of the blood that lacks , has a , is capable of motility , and the body against and by ingesting foreign materials and cellular debris , by destroying infectious agents and cancer cells , or by producing . - Platelets : they are a component of blood whose function is to stop by clumping and clotting blood vessel . Platelets have no cell .
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