Endocytosis and exocytosis
endocytosis to bring in bulk materials
uses ATP
depends on receptor proteins
there are threetypes
i pinocytosis
cell drinking the engulfing of extracellular fluids in small vantities
e g dissolved solutes like vitamons proteins
engulfingliquids
byPinch
if pinocytotic cell will surroundthenengulf
vessicle very spontaneous
ii phagocytosis notallcellscanfacilitate
cell eating the engulfing of extracellular solids e.gwhitebloodcells
protrudingout phagosometoengulf
i 20
É to
cell phagasome primary
lysosome fuse
formationofsecondary
lysome hydrolyticenzymes
digestmaterial
iii receptor mediated endo veryspecific
must create a vesicle importantfor
cell signalingrequires receptorproteinsfrommembrane to engulf
1 If c Ing toformvessicle
at coated ya
membranepincheson
me
It
ma
vessicieformeat
example cholesterol removalofassistors
mustbe large
pertrude engulf us engulf pinch us require cellsignal
solid liquid cathrin pit
exocytosis
releasing substances createdbycell out of Ce
ATP e.g enzymes hormones waste
vesicles carry these matterials after pinched off from golgi trans
face sacs
vesicles will fuse with cell membrane's phospholipids to release contents
of release contents into plasma membrane
vesiclesmovedviamotor
secretion release of useful substance proteins microtubules
excretion release of toxic substance waste