Class notes
Cell membrane basics (Bio 181)
- Course
- BIO 181 (BIO181)
- Institution
- Arizona State University - Tempe
Unit 1 lecture 5, BIO 181, goes through the structure of the cell membrane and how transport occurs.
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Cell membranes and transportPlasma Membrane
Membrane of a cell
Has certian ions come in and out of a cell if we want them to
Major lipid found in cell membrane are Phospholipids
Have hyrophobic and hydroliphic parts
Seperates outer enviornment from inner enviornment in a cell
Diffusion: there is net movement of solute from the area of higher solute
concentration to a lower solute area
The intermingling or substances by natural movement of particles
passive process can occur in water air
Osmosis: passive process by which molecules of a solvent tend to pass
through a semipermeable membrane from a less concentrated solution into a
more concentrated one, thus equalizing the concentrations on each side of
the membrane.
Osmotic gradient: dif in concentration
Osmolyte solute:compounds that affect osmosis
Hypotonic solution: solution with a higher concentration of solutes and a
lower concentration of water than body fluids, pulls water out of cell
isotonic: normal, not affecting osmosis
Hypertonic: solution has lower concentration than inside of cell, water is
pulled into cell
Permiability: the ability to pass through the cell membrane
Hydrophilic (polar or ions) have a hard time passing through
non polar and small polar molecules have an easier/easy time passing
through
Cell membranes and transport 1
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