Exchange of materials - BIOLOGY UNIT 3.1
Unit B3 1.1-1.7
a summary of the notes in the revision textbook
- Created by: Maggie-Anne Evans
- Created on: 30-04-13 19:40
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- LUNGS
- Exchange of Materials
- SPORTS DRINKS
- Sugar replaces the sugar used for energy release in exercise
- water: hydrates and replaces water lost through sweat
- Mineral ions to replace those lost whilst sweating
- ACTIVE TRANSPORT
- Allows cells to take in substances against the concentration gradient
- OSMOSIS
- Diffusion of water across a partially permeable membrane
- Artificial breathing aids
- iron lung
- Breathing aids
- Positive pressure aids
- THE GUT
- Villi are an efficient exchange surface for the absorption of the soluble products of digestion by diffusion or active transport
- PLANTS
- Stomata in plant leaves allow carbon dioxide to diffuse into the leaf from the atmosphere
- leaves are flat and thin with internal air spaces to increase the surface area for exchange of gases
- Root hair cells increase the surface area of the roots
- Transpiration
- Water is lost (by evaporation) through the stomata when they open to let CO2 in.
- Wilting can protect the leaf from excessive water loss
- SPORTS DRINKS
- Breathing in
- Intercostal muscles contract
- Ribcage moves up and out
- Volume of thorax increases,
- Pressure in thorax decreases, air is drawn in
- Breathing Out
- Intercostal muscles retract
- ribcage moves down and in
- Diaphragm is 'domed'
- Volume of thorax decreases
- pressure in thorax increases and air is forced out
- Exchange of Materials
- Exchange of Materials
- SPORTS DRINKS
- Sugar replaces the sugar used for energy release in exercise
- water: hydrates and replaces water lost through sweat
- Mineral ions to replace those lost whilst sweating
- ACTIVE TRANSPORT
- Allows cells to take in substances against the concentration gradient
- OSMOSIS
- Diffusion of water across a partially permeable membrane
- Artificial breathing aids
- iron lung
- Breathing aids
- Positive pressure aids
- THE GUT
- Villi are an efficient exchange surface for the absorption of the soluble products of digestion by diffusion or active transport
- PLANTS
- Stomata in plant leaves allow carbon dioxide to diffuse into the leaf from the atmosphere
- leaves are flat and thin with internal air spaces to increase the surface area for exchange of gases
- Root hair cells increase the surface area of the roots
- Transpiration
- Water is lost (by evaporation) through the stomata when they open to let CO2 in.
- Wilting can protect the leaf from excessive water loss
- SPORTS DRINKS
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