osmosis + active transport Flashcards
what is osmosis
net movement of water molecules across a selectively permeable membrane from a region of higher water concentration to a region of lower water concentration
why can water molecules pass through the membrane both ways during osmosis
as the they move randomly all the time
what is active transport
movement of particles across a membrane against the concentration gradient (lower to higher) using energy released during respiration
in active transport the particles are moved ___ a _____________ gradient rather than down. its also an ________ process so it requires __________
up, concentration, active, energy
why is active transport crucial in the body
as when there is a lower concentration of nutrients in the gut than blood, active allows nutrients to be taken into the blood which stops us from starving
calculation for % change in mass (potato experiment)
final mass - initial mass / initial mass x 100
what is the only thing you change in the potato experiment
the sucrose solution concentration
