diffusion, osmosis and active transport Flashcards
where does the energy for diffusion come from
the kinetic energy from molecules and ions
why is diffusion so important
many life processes depend on it -
oxygen entering blood from lungs
glucose an amino acids pass to blood from gut
plants absorb co2 in leaves
how do substances enter cells
by diffusion through the cell membrane.
how can diffusion speed increase
increase in temperature, shorter distance, concentration gradients kept high - equilibrium is not met so diffusion continues
when is osmosis not osmosis
when there is no partially permeable membrane.
how does osmosis affect plant and animal cells differently?
plant cells are not permanently damaged whereas animal cells are.
cell walls provide the plant cells with support. and it is inelastic.
animal ells will shrink due to loss and burst if they swell too much from intake.
active transport is…
the net movement of particles from a low concentration point to a higher concentration point (opposite the concentration gradient).
