Diffusion

Question 1

what is diffusion

Answer 1

net movement of particles from an area of high concentration to an area of low concentration and it is a passive process as it doesnt require energy

Question 2

what is an example of diffusion in cells

Answer 2

CO2, O2, and urea moving in and out of cells across cell membranes via diffusion

Question 3

what is fascilitated diffusion

Answer 3

net movement of particles down a concentration gradient

Question 4

what are polar molecules

Answer 4

they move across a membrane via fascillitated diffusion as they are too large to move through the membrane
they are repelled by the hydrophobic part of the membrane

Question 5

what are channel proteins

Answer 5

fascillitated diffusion takes place through them
they allow polar molecules to avoid the non polar part of the plasma membrane which will prevent entry

Question 6

what are Aquaporins

Answer 6

channel proteins that allow water to enter through the plasma membrane

Question 7

what are carrier proteins

Answer 7

when a substanec binds to them, they change shape allowing the substance to move from the outside to the inside of the cell