Diffusion and Active Transport

Rachel Roberts
Flashcards by Rachel Roberts, updated more than 1 year ago
Rachel Roberts
Created by Rachel Roberts over 3 years ago


Flashcards for diffusion and active transport, also a few on cell membrane and osmosis.

Resource summary

Question Answer
What is diffusion? Diffusion is the net movement of particles moving into an area of higher concentration to an area of lower concentraion
Why can diffusion occur in both liquids and gases? Because the particles in these substances are free to move about randomly
How would you describe something moving from an area of higher concentration into an area of lower concentration? Moving down it's concentration gradient
What do cell membranes do? Hold cells together and control the movement of substances in and out of the cell
How do cell membranes control the movement of substances in and out of the cell? Through diffusion, active transport and osmosis
Where do particles move through the cell membrane? From where there is an area of higher concentration to an area of lower concentration
What happens if there is a higher concentration of particles on one side of the membrane? There is a net movement from that side
What is active transport? Active transport is the movement of particles across a membrane against the concentration gradient using ATP released during respiration.
Give an example of active transport Active transport of nutrients from the blood into the gut.
What is osmosis? Osmosis is the net movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration
What is a partially permeable membrane? A membrane with very small holes in it which only lets small molecules (e.g. water) pass through it
What is water potential? Water potential is the potential of water molecules moving into or out of a solution.
What does water potential tell you? How concentrated a solution is
If something is turgid, what is it? Plump and swollen
What is turgor pressure? When the contents of a cell push against the cell wall
What factors effect diffusion? - Concentration gradient - Temperature - Distance particles must travel - Surface area
When would diffusion occur faster? - Large concentration gradient - Higher temperature - Shorter distance - Large surface area
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