Karteikarten
Diffusion and Active Transport
Karten in diesem Stapel (17)
- 1What is diffusion?Diffusion is the net movement of particles moving into an area of higher concentration to an area of lower concentraion
- 2Why can diffusion occur in both liquids and gases?Because the particles in these substances are free to move about randomly
- 3How would you describe something moving from an area of higher concentration into an area of lower concentration?Moving down it's concentration gradient
- 4What do cell membranes do?Hold cells together and control the movement of substances in and out of the cell
- 5How do cell membranes control the movement of substances in and out of the cell?Through diffusion, active transport and osmosis
- 6Where do particles move through the cell membrane?From where there is an area of higher concentration to an area of lower concentration
- 7What happens if there is a higher concentration of particles on one side of the membrane?There is a net movement from that side
- 8What is active transport?Active transport is the movement of particles across a membrane against the concentration gradient using ATP released during respiration.
- 9Give an example of active transportActive transport of nutrients from the blood into the gut.
- 10What 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
- 11What is a partially permeable membrane?A membrane with very small holes in it which only lets small molecules (e.g. water) pass through it
- 12What is water potential?Water potential is the potential of water molecules moving into or out of a solution.
- 13What does water potential tell you?How concentrated a solution is
- 14If something is turgid, what is it?Plump and swollen
- 15What is turgor pressure?When the contents of a cell push against the cell wall
- 16What factors effect diffusion?- Concentration gradient
- Temperature
- Distance particles must travel
- Surface area - 17When would diffusion occur faster?- Large concentration gradient
- Higher temperature
- Shorter distance
- Large surface area
Informationen
- Beschreibung
- Flashcards for diffusion and active transport, also a few on cell membrane and osmosis.
- Erstellt von
- Rachel Roberts
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