Diffusion and Osmosis

Question 1

What can the rate of diffusion be affected by?

Answer 1

Pressure
Temperature
Concentration

Question 2

Define osmosis

Answer 2

The diffusion of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane

Question 3

What is active transport?

Answer 3

During active transport salts on ions are pumped from and area of low concentration to and area of high concentration. This process requires energy.

Question 4

Define diffusion

Answer 4

A substance moving from an area of high concentration to an area of low concentration down a concentration gradient in a passive process that requires no energy until equilibrium is reached

Question 5

Describe how visking tubing is a suitable model for a cell membrane

Answer 5

Visking tubing allows substance to pass through as it is semi-permeable and allows molecules that are small enough to pass through. The cell membrane also allows substances to pass through as needed

Question 6

Give an example of when diffusion occurs in the body

Answer 6

Gas exchange