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Mechanism of Cellular Transport

Mechanism of Cellular Transpor

 1. PERMEATION

(A) Simple or passive diffusion

(B) Facilitated diffusion

(C) Active transport

(1) Group translocation.

(2) Membrane bound transport.

(3) Binding protein transport

II. Bulk Transport

(A) Membrane perforation

(1) Inward membrane perforation (e g. uptake of bacteriophages).

(2) Outward membrane perforation (e.g. ejestion in amoebae)

(B) Cytosis

(1) Endocytosis

(a) Positive endocytosis (e.g. reverse cellular budding, cellular fusion)

(b) Negative endocytosis

(i)Pinocytosis (including potocytosis, rhopheocytosis, ultraphago­cytosis, ultramicrophagocytosis and micropinocytosis).

(ii) Phagocytosis (including garanulopexy, colloidopexy, chromopexy, phagotrophy, micellophagosis, arthrocytosis, granulocytosis and dye storage)

(2) Intracytosis

(a) Positive intracytosis (including vacuole fusion, cell plate formation, formation of secondary lysosomes and formation of large secondary (endosomes).

(b) Negative intracytosis (including formation of Golgi vesicles, secondary micropinocytosis and formation of small secondary endosomes

(3) Exocytosis

(a) Positive exocytosis, e.g. secretion.

(b) Negative exocytosis, e.g. cellular budding.
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