Gas Exchange mindmap
- Created by: sam
- Created on: 25-04-13 19:58
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- Gas Exchange
- Thorax
- pressure changes
- Diaphram flattens, ribcage moves up and out
- Increase of volume causes decrease in pressure
- Air from an area of high pressure (outside of lungs) moves to an area of low concentration (inside of lungs)
- Increase of volume causes decrease in pressure
- diaphram arches, ribcage moves in and down
- Decrease in volume causes increase in pressure
- Air from an area of high pressure (inside lungs) moves to an area of low pressure (outside of lungs)
- Decrease in volume causes increase in pressure
- Diaphram flattens, ribcage moves up and out
- pressure changes
- Alveoli
- Gas exchange surface in mammals/birds
- Adapted to maximise effectiveness
- Very large surface area
- Moist lining to dissolve gases( if oxygen gets in blood can be deadly)
- Very thin walls (1 cell thick)
- Good blood supply, arteries run all over them
- Stomata
- Allows
- O2 to diffuse out of leaf
- Water vapour to diffuse out of leaf
- CO2 to diffuse into the leaf
- Allows
- Evaporation of water
- This is affected by
- Air currents
- If the air currents are weaker( if its a still day)
- The evaporation rate will be lower
- If the air currents are stronger( if its windy)
- The evaporation rate will be greater
- If the air currents are weaker( if its a still day)
- Temperature
- If the temperature is higher
- the evaporation rate will be greater
- If the temperature is lower
- the evaporation rate will be lower
- If the temperature is higher
- Humidity
- Air currents
- This is affected by
- Diffusion
- Diffusion is the movement of particles from an area of high concentration to an area of low concentration
- Across a partially permeable membrane
- Osmosis
- Active Transport
- the movement of particles from an area of low concentration to an area of high concentration
- Requires energy
- The movement of water molecules from an area of high concentration(weak solute solution) to an area of low concentration( stronger solute solution)
- Across a partially permeable membrane
- Active Transport
- Diffusion is the movement of particles from an area of high concentration to an area of low concentration
- Exchange surfaces
- Adaptations to maximise effectiveness
- Large surface area
- Has more area to diffuse through
- Short diffusion pathway
- Less distance for molecules to diffuse through
- Good blood supply
- Ventilation
- Important to maintain concentration gradient
- Large surface area
- Adaptations to maximise effectiveness
- Thorax
- Thorax
- pressure changes
- Diaphram flattens, ribcage moves up and out
- Increase of volume causes decrease in pressure
- Air from an area of high pressure (outside of lungs) moves to an area of low concentration (inside of lungs)
- Increase of volume causes decrease in pressure
- diaphram arches, ribcage moves in and down
- Decrease in volume causes increase in pressure
- Air from an area of high pressure (inside lungs) moves to an area of low pressure (outside of lungs)
- Decrease in volume causes increase in pressure
- Diaphram flattens, ribcage moves up and out
- pressure changes
- Key
- Animals
- Plants
- Seperate topic
- General
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