1 Cell Membrane Protean Transports
1.1 Simple Diffusion
Due to the wonderful nature of ENTROPY!!!, things just tend to spread out from high to low concentrations.
1.2 Passive diffusion
- Passive… Passive Diffusion: Non-Polar things simply "fall in" in the direction of chemical gradient
- Facilitated Diffusion: polar molecules selectively get through protean channels
- Osmosis: facilitated diffusion of water through a membrane
Quick ad break for some terms on Osmosis
- Isotonic => inside and outside have the same level of "osmolarity": probablility for osmosis to happen through a semipermiable membrane
- Hypertonic => inside has less osmolarity than the outside: water/other elems will flow out of the cell
- Hypotonic => outside has less osmolarity than the inside: water/other elems will flow into the cell
1.3 Active diffusion
ATP shepherds elements in
1.4 Bulk transport
- Phagocytosis => take a piece of the membrane with you to form a vesticle to introduce large solid elements, recycling the membrane after done — "cell eating"
- Pinocytosis => take a piece of the membrane with you to form a vesticle to introduce large area of the "outside" in — fluid and solid and all, recycling the membrane after done — "cell drinking"
- Endocytosis => Phagocytosis + Pinocytosis
- Extocytosis => opposite of endocytosis