Studied by 2 people
In order for a cell to sustain cell activity, it needs certain substances. We shall look at how cells obtain necessary substances and get rid of unneccessary ones
Diffusion
The movement of substances from area of high concentration to that of lower concentration down the concentration gradient.
Osmosis
The movement of water (or other solvents) through a semi-permeable membrane from area of high water concentration to that of lower water concentration down the concentration gradient.
Active transport
The movement of substances from area of low concentration to that of higher concentration against the concentration gradient.
Where does energy for movement of particles in diffusion and osmosis come from?
From the kinetic energy of the particles
If temperature _____, the rate of diffusion increases
increases
The _____ the concentration gradient, the faster the rate of diffusion
greater
Where does energy for movement of particles in active transport come from?
From aerobic respiration
