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Gas exchange in simple
unicellular organisms
- The cell membrane is the site of gas exchange
- Example of a unicellular org
- Amoeba
- Amoeba
- Where do they live
- Live in water and diffusion of gases occurs over the whole body surface
- Live in water and diffusion of gases occurs over the whole body surface
- They have:
- A large surface area to volume ratio
- Their membranes are thin and moist
- Short diffusion pathways
- Are small and need to be small in order for
diffusion to be efficient
- A large surface area to volume ratio
- How they become larger
- Aggregate their cells together
- Aggregate their cells together
- The process of diffusion is slow
- WHY?
- Materials need to be exchanged between
different organs as well as the environment
- Materials need to be exchanged between
different organs as well as the environment
- WHY?
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