Topic 3 - Transport In Cells Flashcards
What is the definition of osmosis
Is the the movement of water from a dilute solution to a concentrated solution through a partially permeable membrane
What does dilute mean
Small amount of solute
What does concentrated mean
High amount of solute
What is active transport
The movement of particles from a low to a high concentration which goes against the concentration gradient
What does active transport require
Energy
Where does active transport happen in a plant
Root hair cells-absorption of ions
Where in animals does active transport happen
In the villi-absorption of small amounts of sugar
Do single felled organisms have a relative large surface area to volume ratio or a smaller one
Large
The effectiveness of an exchange surface is increased by
-having a large surface area
-a membrane that is thin to provide a short diffusion path
-having an efficient blood supply
-being ventilated
What is the definition of diffusion
The movement of particles from a high concentration to a low concentration
The rate of diffusion can be affected by
Temperature
Distance
Surface area
Concentration
Why does temperature affect rate of diffusion
The higher the temperature the more energy particles have making them move quicker
How does distance affect rate of diffusion
The more distance to go to a lower concentration the harder it is
Why does surface area affect rate of reaction
Bigger the surface area the more diffusion can take place
