Cell Surface: Plasma Membrane

Cytoplasm

Organelles and inlcusions

-glcocalyx has to do w/sugar

-glcocalyx -- recoginize and responds to the cells

-transforms cells

-microvilli-- finger like folds (increases surface area)

-junctions

   --tight junctions

      -prevent anything from passing

   --desmosomes

   --gap junctions

-membrane transport

-generate and maintain membrane potential

-cell-enviornment interactions

-cell membrane is permemable

-passive and active transport

-diffusion

   -simple

   -facilitated

-osmosis

-filtration

-if polar = can go through membrane

-if nonpolar = must have a channel

-need transport membranes

-cells can add more channels if needed

-diffusion of water through a selective permemable membrane

-tonicity

   -isotonic

   -hypertonic

   -hypotonic

-forces water and solutes through a membrane via hydrostatic pressure

-ex. kidneys

-ATP = ADP +Pi

-Pi can be added to another molecule ie. protein

-sodium potassium exchange pump

-sodium pumped out

-potassium pumped in

-responsible for membrane potential

-ATP needed

vesicular transport

  exocytosis

vesicular transport

  endocytosis

-positive on the outside

-negative on the inside

-potential = difference in charge

-establish and maintain