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Ch 7 - Coggle Diagram
Ch 7
7.1: Cellular membranes are fluid mosaics of lipids and proteins
Fluid mosaic model- membrane structure depicts the membrane as a mosaic of protein molecules bobbiung in a fluid bilayer of phospholipids
[] gradient- barrier that separates the difference in [] with 2 or more "areas"
The barrier is not always visible
Amphipathic- contains polar and nonpolar regions
Cell trasport-
diffusion
facilated diffusion
osmosis
Active transport-
req. atp
movement of substances of low[] to high []
against the [] gradient
Passive Transport-
no atp req.
movement of substances from high [] to low []
down [] gradient
unsaturated - higher fluidity ( due to double bonds)
saturated- lower fluidity
Cell membrane-
semipermeable
AKA fluid mosaic models
controls glycoproteins, glycolipids, carbohydrates and cholesterols
Peripheral proteins- bound to the surface of the membrane
Integral proteins- penetrate the hydrophobic core
Transmembrane proteins- integral proteins that span the membrane
7.4: Active transport uses energy to move solutes against their gradients
Electrogenic pump- transport protein that generates voltage across a membrane, storing energy that can be used for cellular work
Cotransport- active transport of solute indirectly drives transport of other substances
7.2: Membrane structure results in selective permeability
Transport proteins-
Channel
carrirer proteins
Aquaporins- increase the rate of passage of water molecules
7.5: Bulk transport across the plasma membrane occurs by exocytosis and endocytosis
Exocytosis- transport and release
Endocytosis- macromolecules taken into the cell
7.3: Passive transport is diffusion of a substance across a membrane with no energy investment
Diffusion- all substance except H2O
Difussion req. [] gradien
Passive Transport-
Diffusion
Facilitated diffusion
Osmosis
Osmosis- H2O
Osmosis req. a semipermeable membrane
Tonicity- gain or lose water
Isotonic- cell = solute []
Hypertonic-Solute [] greater than the cell
Hypotonic- solute [] less than the cell
Osmoregulation- control of solute [] and water balance
