cell membrane 3/4 (transports) Flashcards
what’s simple diffusion
random movement down a concentration gradient
what makes a rate of diffusion faster? (4)
large surface area of membrane
thin membrane
large concentration gradient
membrane is more permeable to the molecule
what molecules are good for simple diffusion
smalll uncharged molecules
what does facilitated diffusion use
channels or carrier proteins
ATP ase how many in and how many out
3NA out 2K in
what needs to be considered for carrier mediated transport
specificity, saturation, and competition
what does specificity refer to?
how specific a transporter is with what it transports.
what does a low level of specificity mean for transporters
more types of things can move through
what is competition?
molecules will compete for transporters with low specificity
what does saturation occur?
when all transporters are being used to their full capacity
does vesicular transport require atp
yes
what are the three types of vesicular transport
phagocytosis, endocytosis, exocytosis
what does phagocytosis do
creates a vesicle using the cytoskeleton to digest a bacteria
how are endocytosis and phagocytosis different
endocytosis intents inward, while phagocytosis extends the cytoskeleton out
region of membrane that have slight indentations contain a high level of ___________
clatherin
