gas exchange surfaces
- Created by: kierasanghera
- Created on: 23-05-16 11:27
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- gas exchange surfaces
- passive exchange
- no energy required
- e.g diffusion and osmosis
- active exchange
- energy required
- active transport
- surface area to volume ratio
- for an organism to be effective it must have a large surface area to volume ratio
- this applies mostly to smaller organisms as larger ones cannot have a large s.a to vol ratio meaning they need a gas exchange system
- reasons why some organisms do not need exchange systems
- size and shape of body, may have small elongated body meaning there is a larger sa. to vol ratio and a shorter diffusion pathway
- if energy demands are low
- good exchange surfaces have
- a large surface area
- thin barrier to reduce diffusuon distance
- large conc. gradient
- definitions
- respiration:biochemical processes by which energy is released from glucose
- ventilation a sequence of breathing movements that moves gases to and from the internal gas exchange surface:
- gas exchange:oxygen passes from the atmosphere into the blood and co2 passes out entirely by diffusion
- passive exchange
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