transport across cell membranes Flashcards
(19 cards)
passive transport
no input of energy
passive transport
what three types
particles move without any input of energy
-diffusion
-Osmosis
- facilitated transport
diffusion
-High concentration to an area of low concentration
- must have a membrane that is permeable to particles and concentration gradient
osmosis
-diffusion of water molecules across a membrane
- high concentration to low concentration
hypotonic
High concentration of water
low concentration of solution
Hypertonic
Low concentration of water
High concentration of solution
isotonic
equal concentrations on both sides of the member
facilitated diffusion
The use of transport protein to get molecules and ions across the membrane
carrier proteins
specialized shapes that make them highly selective
can only transport specific substances
channel proteins
allows charged ions in and out
Active transport
-Energy is required to get the particles across the membrane
-Low to high concentration
- maintain an environment in a cell
some molecules can’t move through the cell membrane because
are too big
can’t dissolve in water( need to dissolve for diffusion)
endocytosis
- enter
- cell takes in substances that can’t be moved by passive or active transport
-the membrane folds around the particles
vesicle
Sphere form for transporting things within the cell
vacuole
sphere form for storage
- phagocytosis
- pinocytosis
phagocytosis
taking in larged particles or other cells
pinocytosis
taking in drops of fluid 
receptor mediated endocytosis
when a receptor protein identifies a particle and starts endocytosis
Exocytosis
-exit
-when material that are in vesicle and vacuoles in the cell are allowed to exit
