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Animal Physiology
Membrane Physiology
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Created by
Katie Mlodzik
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Cards (13)
Plasma membrane
Outer
boundary of every cell
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Plasma membrane
Selective permeability
No
cell wall
Extremely thin layer of
lipids
and
proteins
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Phospholipid bilayer
Polar
Non-polar
"Sandwich" appearance
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Hydrocarbon tails
Short & unsaturated =
high
permeability & fluidity
Long & saturated =
low
permeability & fluidity
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Cholesterol
Regulates
membrane
fluidity
Bidirectional
regulator of fluidity
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Lipids
No bonds
Amphipathic
Steroid
Fused ring
structure
Kinked tail
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High
temperature
Increases
membrane fluidity
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Otis et al. (2011): 'Cholesterol and lipoprotein dynamics in a hibernating mammal'
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Fluid mosaic model
Fluid
lipid bilayer
embedded with (integral)
proteins
and carbohydrates
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Osmosis
Movement of water from
high
concentration to
low
concentration through a
semipermeable
membrane
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Passive diffusion
Unassisted membrane transport
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Selective permeability
High
concentration to
low
concentration
Concentration
gradient
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Tonicity
The
response
of
cells
or
tissues
immersed in the solution
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