Movement across membranes

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  • Created by: Akshay101
  • Created on: 29-04-18 21:34
Define diffusion
The movement of particles from an area of high concentration to an area of low concentration.
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Define osmosis
The movement of water molecules across a partially permeable membrane from a region of high water (low solute) concentration to a region of low water (high solute) concentration.
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Why can't diffusion take place in solids?
The particles cannot move in solids
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When is equilibrium reached?
Equilibrium is reached when there is an equal concentration of the solute in all regions of the system (there is no concentration gradient).
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Give 3 factors that affect the rate of diffusion
1) The concentration gradient 2) The temperature 3)The diffusion distance
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What is the difference between a passive and an active process?
A passive process doesn't require any energy
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Give an example of an active process
Active transport
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Why is energy needed for active transport and where does it get its energy from?
Energy is needed for the carrier protein to change shape to squeeze the particles against the concentration gradient and it gets its energy from respiration.
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What is the dependent variable in the osmosis required practical?
The final mass of potato sample
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How are villi adapted to make diffusion easier?
They have a large surface area so more nutrients can be absorbed quicker and the distance of diffusion is really less.
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Other cards in this set

Card 2

Front

Define osmosis

Back

The movement of water molecules across a partially permeable membrane from a region of high water (low solute) concentration to a region of low water (high solute) concentration.

Card 3

Front

Why can't diffusion take place in solids?

Back

Preview of the front of card 3

Card 4

Front

When is equilibrium reached?

Back

Preview of the front of card 4

Card 5

Front

Give 3 factors that affect the rate of diffusion

Back

Preview of the front of card 5
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