B3.1
- Created by: JoelHarman
- Created on: 18-10-16 17:16
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- B3.1- Movement of molecules in and out of cells
- B3.1.1 Dissolved substances
- Diffusion
- Movement of substances from a high concentration to a low concentration
- Happens through a partially permeable membrane
- Osmosis
- Diffusion of water
- From a high concentration to a low concentration
- Happens in plants and animals
- Active transport
- Requires energy from respiration
- Moves substances against the concentration gradient
- Isotonic
- Sports drinks replace sugars, ions and water
- Without these cells do not work as efficiently
- Sports drinks replace sugars, ions and water
- Diffusion
- B3.1.2 Gaseous exchange
- Lung location
- Located in the upper thorax
- Protected by the ribcage
- Separated by the diaphragm
- Lung movement
- Lungs expand to allow air in
- Lugs contract and push in to push the air out
- Aveoli
- Specialised cells in the lungs for diffusion
- Large surface area
- Thin rows of cells
- Good blood supply
- Other specialised cells
- Villi in intestines
- Specialised cells in the lungs for diffusion
- Lung location
- B3.1.3 Exchange systems in plants
- Substances
- CO2 Absorbed by leaves
- Water and ions absorbed through roots
- Roots
- Increased surface area from root hairs
- Leaves
- Increased surface area from flattened shape and internal air spaces
- Water vapour is lost through stomata in the leaves
- Stomata
- Surrounded by guard cells
- Guard cells close together in times of drought to stop water loss
- Guard cells open
- Substances
- B3.1.1 Dissolved substances
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