Cell Bio - Diffusion

Question 1

Define Diffusion

Answer 1

The net movement of particles from an area of higher concentration to an area of lower concentration DOWN the concentration gradient

Question 2

• Define the term “Net Movement”?
• Define the term “Concentration Gradient”?

Answer 2

• The movement of all of the particles considered together as a group.
• Difference in the concentration between two areas of a substance

Question 3

Explain why diffusion is important to all cells

Answer 3

Helps cells gain essential materials for energy and growth whilst getting rid of waste products.

Question 4

State three waste products a cell produces

Answer 4

• Carbon Dioxide - Waste product of Aerobic Respiration
• Urea
• Ammonia

Question 5

State three important substances a cell requires and describe their functions

Answer 5

• Glucose - Needed for Aerobic Respiration
• Oxygen - Needed as an energy source for making ATP
• Amino Acids - Needed for making Proteins

Question 6

State and describe the three factors that affect the rate of diffusion

Answer 6

1. Concentration Gradient - the larger the concentration gradient, the higher the rate of diffusion
2. Temperature - The higher the temperature, the higher the rate of diffusion
3. Surface Area - the larger the surface area, the higher the rate of diffusion.

Question 7

• Explain the process of Diffusion
• Diffusion stops when…

Answer 7

• Particles collide with each other or their container, making them change direction. Eventually, the particles are spread through the whole container or substance.
• …the concentration of the substance is equal in all areas.