transport in cells
- Created by: Miabradley123
- Created on: 20-08-17 15:31
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- Transport in Cells
- Diffusion
- Definition: The spreading out of particles from an area of higher concentration to an area of lower concentration.
- Simpler terms: The gradual movement of particles from places where there are lots of them to places where there are fewer of them.
- It happens in both solutions and gases because the particles are free to move randomly.
- Rate of diffusion can be effected by the concentration gradient, temperature and surface area.
- Definition: The spreading out of particles from an area of higher concentration to an area of lower concentration.
- Osmosis
- Definition: The movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration.
- A partially permeable membrane is a membrane with very small holes and so only water molecules are small enough to fit through.
- Water molecules pass both ways through the membrane.
- Osmosis is a type of diffusion.
- Definition: The movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration.
- Active Transport
- Definition: The movement of particles against a concentration gradient using energy transferred during respiration.
- A concentration gradient is a difference in concentration between two areas next to each other.
- Active transport in plant roots
- Active transport allows the plant to absorb minerals from a very dilute solution, against a concentration gradient.
- Active transport in the gut
- Active transport is used in the digestive system when there is a lower concentration of nutrients in the gut, but higher concentration of nutrients in the blood.
- Definition: The movement of particles against a concentration gradient using energy transferred during respiration.
- Diffusion
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