Diffusion Flashcards
what is simple diffusion
movement through the lipid layer.
e.g. simple diffusion
oxygen and carbon dioxide
what is facilitated diffusion
molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.
example of facilitated diffusion
glucose or amino acids
what is osmosis
movement of water across the membrane
e.g. osmosis
only water
what is active transport
active transport is the movement of molecules or ions across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient.
e.g. active transport
certain ions, amino acids, glucose
Endocytosis def
involves cells taking in substances from outside the cell by engulfing them in a vesicle derived from the cell membrane
Exocytosis def
is a form of active transport and bulk transport in which a cell transports molecules out of the cell
hydrophilic
water loving
hydrophobic
water hating
