Transport of Large Molecules (Bulk Transport)
During bulk transport the membrane changes its form and shape. It occurs in two ways: (i) Endocytosis (taking the substance in) (ii) Exocytosis (passing the substance out)
Endocytosis is of two types:
(i) Endocytosis
Phagocytosis
- intake of solid particles
- membrane folds out going round the particle, forming a cavity and thus engulfing the particle
Pinocytosis
- intake of fluid droplets
- membrane folds in and forms a cup like structure sucks in the droplets
Cell membrane regulates movement of substance into and out of the cell. If the cell membrane fails to function normally the cell dies.
iasmania
