6970638
Description
Mind Map by Katie Hughes, updated more than 1 year ago
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Created by Katie Hughes
about 8 years ago
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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
- provide
a
partially
permeable
membrane
- fluid mosaic molecule
- fluid
- individual phospholipids move around
within their layer
- individual phospholipids move around
within their layer
- mosaic
- pattern produced by scattered
proteins when viewed from above
- 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
- can form sheets (bilayer)
- cholesterol
- prevent ions/molecules
passing thorugh
- helps regulate fluidity
- stabilises
phospholipid bilayer
- prevent ions/molecules
passing thorugh
- proteins
- intrinisic
- channel
- carrier
- channel
- extrinsic
- intrinisic
- Glycolipids and glycoproteins
- short carbohydrate chains
attach to lipids and proteins
- receptors
- antigens
- cells adhere
- short carbohydrate chains
attach to lipids and proteins
- fluid
- 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
- or large molecules
- can get through...
- O2
- CO2
- lipid soluble molecules
- oestrogen
- testosterone
- oestrogen
- O2
- molecules pass through the
phospholipid bilayer
- facilitated diffusion
- protein molecules exists in
membranes to facilitate diffusion
- channel protein
- transmembrance protein forms
tunnel through bilayer
- Na+
Cl-
K+
- transmembrance protein forms
tunnel through bilayer
- carrier protein
- change shape to help molecules
move in and out cells
- amino acids
glucose
- change shape to help molecules
move in and out cells
- channel protein
- protein molecules exists in
membranes to facilitate diffusion
- factors effecting diffusion
- concentration gradients
- temperature
- surface area
- concentration gradients
- net movement of molecules or ions from a region of
high concentration to a gradient of low concentration
- 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
- energy from respiration
in the form ATP
- osmosis
- high water potential to
low water potnetial
- measured in KPA
- pure water has 0KPA
- highest water potential
- hypotonic
- high WP low solute
concentration
- high WP low solute
concentration
- hypertonic
- low WP high solute
concentration
- low WP high solute
concentration
- isotonic
- equal [otential
- equal [otential
- turgid
- plant cell where cell membrane
exerts pressure on the cell wall
- plant cell where cell membrane
exerts pressure on the cell wall
- plasmolysed
- cell membrane shrunk
away from cell wall
- cell membrane shrunk
away from cell wall
- hypotonic
- highest water potential
- pure water has 0KPA
- high water potential to
low water potnetial
- diffusion
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