factors affecting the rate of transport of substances across cell membrane

Question 1

what are three factors affecting the rate of transport of substances across the cell

Answer 1

• concentration gradient
• surface area and volume
• types of solutions and selectively permeable membrane

Question 2

concentration gradients

Answer 2

if the concentration gradient is very high then the molecules will move faster into a space with a low concentration gradient

Question 3

surface area and volume

Answer 3

the larger the surface area ratio to volume ratio the faster substances can get into and across a cell.

smaller objects have a larger surface area to volume ratio than bogger objects

Question 4

what are the different types of solutions

Answer 4

• hypertonic solution
• isotonic solution
• hypotonic solution

Question 5

what is a hypotonic solution

Answer 5

has a lower solute concentration (more water) than the other solution (inside the cell)

Question 6

what is a hypertonic solution

Answer 6

has more solute concentration (less water) than the other solution (inside the cell)

Question 7

what is an isotonic solution

Answer 7

have the same amount of concentrations (same amount of water) on both sides of the selectively permeable membrane (inside the cell)

Question 8

what would happen if a cell is placed into a hypotonic solution

Answer 8

water will enter the cell and the cell will swell and burst

Question 9

what would happen if a cell is placed into a hypertonic solution

Answer 9

water will leave the cell and the cell will shrink

Question 10

what would happen if a cell is placed into an isotonic cell

Answer 10

the concentrations of the solute and water are equal on both sides of the membrane