Cell Bio - Diffusion Flashcards

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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 meaning of “Net Movement”?

A

The movement of all of the particles considered together as a group.

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3
Q

Why is the cell membrane is known as “selectively permeable”?

A

Because only certain molecules can diffuse through them

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4
Q

Define the term “Concentration Gradient”

A

It is the difference in the concentration between two areas of a substance

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5
Q

Explain why diffusion important to all cells

A

It helps cells gain materials that are essential for energy and growth whilst also getting rid of waste products.

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6
Q

Diffusion stops when…

A

…the concentration of the substance is equal in all areas.

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7
Q

State three waste products a cell produces

A
  • Carbon Dioxide - Waste product of Aerobic Respiration
  • Urea
  • Ammonia
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8
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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9
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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10
Q

Explain the process of Diffusion

A

The particles collide with each other or their container, which makes them change direction. Eventually, the particles are spread through the whole container or substance.

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