The cis-Golgi and trans-Golgi membranous networks form an inte-
phagy) as well as endogenous material (autophagy). Phagocytosis
gral part of the Golgi apparatus. The cis-Golgi network is a region of
consists of the cellular uptake of invading pathogens, apoptotic cells
complex membranous channels interposed between the rough endo-
and other foreign material by specialized cells. Lysosomes are numerous
plasmic reticulum and the Golgi cis-face, which receives and transmits
in actively phagocytic cells, e.g. macrophages and neutrophil granulo-
vesicles in both directions. Its function is to select appropriate proteins
cytes, in which lysosomes are responsible for destroying phagocytosed
synthesized on the rough endoplasmic reticulum for delivery by vesicles
particles, e.g. bacteria. In these cells, the phagosome, a vesicle poten-
to the Golgi stack, while inappropriate proteins are shuttled back to the
tially containing a pathogenic microorganism, may fuse with several
rough endoplasmic reticulum.
lysosomes.