lesson 14 diffusion Flashcards
what is diffusion
the spreading out of particles resulting in a net movement from an area of higher concentration to an area of lower concentration
cells need oxygen for respiration, which is carried out by what
mitochondria
why are cells surrounded by a high concentration of oxygen
as oxygen is transported in the blood streams from the lungs
which 3 molecules move in and out of cells via diffusion
O
CO₂
urea
the oxygen molecules move into the cell via diffusion from…
an area of higher concentration (out of the cell) to an area of lower concentration (in the cell)
the oxygen is used to generate the energy in respiration, and this produces which waste gas
meaning…
CO₂
meaning we have a higher concentration of CO₂ inside the cell than outside
how does CO₂ move out of the cell
via diffusion
what is urea
a waste product produced inside cells
how is urea diffused
it diffuses out of the cells into the blood plasma and is excreted into the kidneys
what’s the first factor diffusion is affected by
the difference in concentrations
what is the difference in concentrations called
the concentration gradient
the greater the concentration gradient, the what
the greater the rate of diffusion
if the concentration gradient is small what will happen
diffusion will be slower
what’s the second factor that affects the rate of diffusion
because…
the higher the temperature, the greater the rate of diffusion
because the particles have more kinetic energy and are moving faster
the final factor that affects the rate of diffusion is what
the surface area of the membrane
