Diffusion, Osmosis and Active Transport
- Created by: ChloeLW
- Created on: 22-10-17 13:26
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- Diffusion, Osmosis and Active Transport
- Diffusion
- Diffusion is the net overall movement of particles from an area of higher concentration to an area of lower concentration
- Happens in both liquids and gases
- Only small molecules can diffuse through cell membranes
- E.g. Glucose, Amino Acids, Water and Oxygen
- Big molecules such as starch and proteins will not fit through the membrane.
- Osmosis
- Osmosis is the net movement of water molecules across a partially permeable membrane from an area of higher water concentration to an area of lower water concentration.
- Only very small molecules, such as water can pass through partially permeable membranes
- Water Molecules pass both ways during osmosis
- Active Transport
- Active Transport is the movement of particles across a membrane against a concentration gradient, using energy transferred during respiration.
- An example of Active Transport is the digestive system.
- When there is a higher concentration of nutrients in the gut then in the blood the nutrients diffuse naturally into the blood
- Active Transport allows nutrients to be taken into the blood against a concentration gradient, which is essential to stop us starving.
- When there is a higher concentration of nutrients in the gut then in the blood the nutrients diffuse naturally into the blood
- An example of Active Transport is the digestive system.
- Active Transport is the movement of particles across a membrane against a concentration gradient, using energy transferred during respiration.
- Diffusion
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