transport: cell membrane Flashcards
cell membrane
selectively regulates flow of material
fluid mosaic model
movement of embedded proteins “waves”
factors of movement include:
- size (small move freely and waste products)
- solubility (hydrophobic/lipids/hydrophilic)
- charge (polarity) + or -
- pH, high or low
what molecules need a receptor site for entry/exit
large molecules
what is cystic fibrosis?
deflect in chlorine channel
- CFTR —> mucus builds up in lungs ==> recurring gene infection ==> DEATH
diffusion AND passive transport
- no energy/atp required by the cell diffusion.
- involves a concentration gradient.
- when gradients have a high gradient, they begin to collide. this collision creates kinetic energy that allows particles to move from a [high] to a [low] / “DOWNHILL”. this movement will occur until an equilibrium is met.
what is an example of diffusion and passive transport?
osmosis —> water movement ==> type of diffusion
active transport
energy/atp is required by the cells proteins embedded in the cell membrane (receptors) move particles against a [] gradient
“UPHILL” —> [low] to [high]
pinocytosis
CELLULAR DRINKING. (pinch)
large dissolved molecule enclosed by the membrane, becoming a vacuole
phagocytosis
CELLULAR EATING. (engulf/swallow)
large undissolved molecule engulfed and surrounded w/in a vacuole
circulation
intercellular circulation
- diffusion
- cyclosis (natural streaming of cytoplasm) ** MAY ALSO INCLUDE THE ER
coda
- cyclosis
- osmosis
- diffusion
- active transport
how does materials move in protist?
diffusion & active transport
how does circulation occur in protist?
diffusion and cyclosis
arteries
nutrients + O2 (high pressure)
