Movement of Membranes

phospholipid bilayer

allows fat to enter
top of phospholipid
- polar, hydrophillic (h2o loving)
- barrier: most things in cell is h20 loving
bottom of phospholipid bilayer
- nonpolar, hydrophobic (h2o hating)
- stabalizer
phospholipid bilayer keeps out
- large molecules
- h2o loving
- charged molecules/atoms (ions)
phospholipid bilayer lets through
- h2o haters
- small molecules
types of proteins
- facilitated diffusion
- enzyme
- active transport
- hormone
- attachment
- ID
structure of phospholipid

proteins embedded in
facilitated diffusion
- high concentration of large polar molecules
- change & make a channel that lets in large, polar, charged molecules
enzyme

changes molecule & results in chemical reaction
active transport
- can carry specific molecule into cell using energy
- low concentration of small polar molecule
hormone
- protein in recpetor/attachment site
- causes chemical change in cell
- messengers: prostate gland in neurotransmitter
attachment

chemical attached to protein never detaches
ID
- macrophage touches & destroys if no ID
- holder for cell ID
phagocytosis
- cell engulfs & brings in cells & particles
- lysosome digests bacteria
endocytosis

engulfs & brings in molecules
exocytosis

brings out molecule
osmosis

water moves to balance concentration
isomatic

even concentration
hypertonic

water leaving particle
hypotonic

water entering particle

Author

ht2lvu

46955

Card Set

Movement of Membranes

Description

Proteins & Membranes

Updated

2010-11-03T05:51:24Z

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