Plasma membrane & membrane transport

intercellular fluid and extracelluar fluid

PM seprates them, keeps good things in, bad things out

phospholipids, cholesterol, protein

what are the components for plasma membrane

phospholipid

2 fatty tails 1 head

head of phospholipids

glycerol and phosphate

tails of phospholipid

fatty acid, natural rearranged, can slide pass each other (not stack)

cholesterol

keeps phospholipids to be free and slide

membrane protein

structural element, transport & channels, enzyme, signaling protein, receptor

structural element

shape, cytoskeleton

transport and channels

move across the membrane

enzyme

speeds up process

signaling protein

outgoing signals

receptor

incoming signal

protein of membrane

top and bottom= hydrophilic

middle=hydrophilic

big and hydrophilic getting thru membrane=

need protein

ions (strong charge) for getting thru membrane=

need protein

hydrophobic and small weak molecules that are hydrophilic thru membrane=

do not need protein

simple diffusion

small and punch thru membrane

facilitated diffusion

need a protein to get thru membrane

active transport

needs energy and protein to get their membrane

concentration

how much voulme in a liter

concentration gradient

difference how much in the space

diffusion

moving randomly b/c kinetic energy, evens out eventually

omosis

water moving toward particles

osmolarity

total number of particles in all substances

300 mOsm

how much is normal osmolarity of cell and blood cells

iso-osmotic

same

hyperosmotic

more (above 300)=shrink

hypo-osmotic

less (less than 300)=swell

tonicity

effect cell shape

isotonic

same no change

hypertonic

more=shrink

hypotonic

less=burst/swell