anatomy membrane transport Flashcards
what are two different types of transport?
- active
- passive
membrane transport
takes place in the plasma membrane
what is the plasma membrane?
- semi-permeable phospholipid bilayer that surrounds the cell and all organelles
- controls what enters and exits the cell
what is the function of passive transport?
- move substances of high concentration to low concentration
- does NOT require energy
what are the 3 types of solutions in passive transport?
hypertonic, hypotonic, isotonic
water moves towards the most what?
solute
where does the water move in a hypertonic solution?
water moves out of the cell
where does the water move in an isotonic solution?
water moves back and forth. in and out of the cell
where does the water move in a hypotonic solution?
water moves into the cell
in a hypotonic solution, there is more what than what?
there is more solute inside the cell than outside cell
in an isotonic solution, there is equal what?
there is equal solute on both the inside and outside of the cell
in a hypertonic solution, there is more what than what?
there is more solute on the outside of the cell than the inside
what is osmosis?
diffusion of water across the plasma membrane
what is facilitated diffusion?
larger/polar substances that cross the plasma membrane via carrier proteins
what is simple diffusion?
substances move directly through the plasma membrane
