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6970638
Cell membranes
Description
revision
No tags specified
biology
biology
as level
Mind Map by
Katie Hughes
, updated more than 1 year ago
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Created by
Katie Hughes
almost 8 years ago
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Resource summary
Cell membranes
Functions
provide a partially permeable membrane
provide structural support
act as channels transporting water soluble substances
allow actrive transport through thorugh carrier proteins
form cell surface receptors for identifying cells
help cells adhere together
act as recpetors
fluid mosaic molecule
fluid
individual phospholipids move around within their layer
mosaic
pattern produced by scattered proteins when viewed from above
Phospholipid
can form sheets (bilayer)
form membrane bound compartments
act as a barrier to water soluble substances
cholesterol
prevent ions/molecules passing thorugh
helps regulate fluidity
stabilises phospholipid bilayer
proteins
intrinisic
channel
carrier
extrinsic
Glycolipids and glycoproteins
short carbohydrate chains attach to lipids and proteins
receptors
antigens
cells adhere
transport across cell membranes
diffusion
net movement of molecules or ions from a region of high concentration to a gradient of low concentration
occurs down a concentration gradients
result= equilibrium
simple diffusion
molecules pass through the phospholipid bilayer
polar moleculars or ions cannot pass through the bilayer
or large molecules
can get through...
O2
CO2
lipid soluble molecules
oestrogen
testosterone
facilitated diffusion
protein molecules exists in membranes to facilitate diffusion
channel protein
transmembrance protein forms tunnel through bilayer
Na+ Cl- K+
carrier protein
change shape to help molecules move in and out cells
amino acids glucose
factors effecting diffusion
concentration gradients
temperature
surface area
active transport
energy from respiration in the form ATP
makes carrier proteins change shape
reabsorption in kidneys
digestion in gut
loads sugar in to phloem
inorganic ion uptake in root hairs
osmosis
high water potential to low water potnetial
measured in KPA
pure water has 0KPA
highest water potential
hypotonic
high WP low solute concentration
hypertonic
low WP high solute concentration
isotonic
equal [otential
turgid
plant cell where cell membrane exerts pressure on the cell wall
plasmolysed
cell membrane shrunk away from cell wall
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