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Gen Zoology
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Transport ProcessesTransport Processes
Ms. Rubie Maranan-Causaren
Passive vs. Active Processes
P iPassive processes
Simple diffusion
Osmosis
Osmosis: film clip
OsmosisOsmosis
Tonicityy
Hypertonic solutionHypotonic solution Isotonic sol’n
0.9% NaCl
Effect of hypertonic solution to plant
cells
Filtration
Facilitated diffusion
Active Processes
Primary Active Transport
Primary Active Transport (continued)
Secondary Active Transport
Secondary active transport. The Na+/K+ pump (a) maintains a concentration of Na+ions that is higher outside the cell than inside. The resulting Na+ gradient providesenergy for secondary active transport pumps. The sodium ions diffuse back into thegy y p p pcell by facilitated diffusion. As these ions diffuse some molecules, like glucose, diffusein the same direction (b); while others, like H+ and Ca2+ , diffuse in oppositedirections.
Bulk TransportBulk Transport
Phagocytosislysosomes
phagocyte bacteria pseudopods fusepseudopod
a. c.b.
h l /di ti l phagosome
f.
degraded bacterium
e.
phagolysosome/digestion vacuole
d.
phagosome
Phagocytosis. (a) A phagocyte approaches particles (e.g. bacterium). Pseudopodst d f th ll (b) d d th ti l ( ) t b t k i t th ll bextend from the cell (b) and surround the particle (c) to be taken into the cell by
phagocytosis. The pseudopods fuse to form a phagosome (d) which fuses with aprimary lysosome (e) and the bacterium would then be degraded (f).
Phagocytosis
Pinocytosisextracellular fluid
cytoplasm
pinocytic vesicle
Pinocytosis. Membrane folds inward forming apinocytic vesicle.
PinocytosisPinocytosis
Receptor-pmediated
endocytosisendocytosis
Receptor-mediated endocytosis
Exocytosist ll l fl idextracellular fluid
cytoplasm
secretory vesicle from Golgi
cytoplasm
secretory vesicle from Golgi complex
Exocytosis. The membrane of the secretory vesicle fuses withExocytosis. The membrane of the secretory vesicle fuses withthat of the plasma membrane and the secretory product isreleased into the exterior of the cell.
ExocytosisExocytosis
Endocytosis and exocytosis
Salamat!Salamat!