Transport of Large Molecules (Bulk Transport)

  • 13/03/2025
cell wall 2

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

  1. intake of solid particles
  2. membrane folds out going round the particle, forming a cavity and thus engulfing the particle

Pinocytosis

  1. intake of fluid droplets
  2. 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.

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