Cell Bio - Diffusion Flashcards

1
Q

Define Diffusion

A

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

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2
Q
  • Define the term “Net Movement”?
  • Define the term “Concentration Gradient”?
A
  • The movement of all of the particles considered together as a group.
  • Difference in the concentration between two areas of a substance
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3
Q

Explain why diffusion is important to all cells

A

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

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4
Q

State three waste products a cell produces

A
  • Carbon Dioxide - Waste product of Aerobic Respiration
  • Urea
  • Ammonia
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5
Q

State three important substances a cell requires and describe their functions

A
  • Glucose - Needed for Aerobic Respiration
  • Oxygen - Needed as an energy source for making ATP
  • Amino Acids - Needed for making Proteins
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6
Q

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

A
  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.
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7
Q
  • Explain the process of Diffusion
  • Diffusion stops when…
A
  • 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.
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