oogenesis spermatogenesis cycle diagram quizlet step ovum oocytes haploid reproductive medbullets process female system fertilization mature development immunity identify cells mediated involved antibody correctly system structures easynotecards lymphatic chapter notecard phagocytosis cell animation endocytosis lysosome exocytosis phagosome immune system cells particulate leukocytes macrophages blood such debris bacteria membranes phagocytose phagocytosis