What is Osmosis?
- Osmosis is the movement of water through a partially permable membrane.
- Osmosis needs no energy from the cell
- It diffuses water from high water concentration (dilute) to low water concentration (more concentrated).
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What is a 'Partially Permable membrane'?
- Membranes which only let some types of particles through.
- They let water move across them (osmosis)
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Whats the difference between 'diffusion' and 'osmo
- Diffusion refers to the movement of any particles from a region of hight to low concentration
- Osmosis only refers to the movement of water molecules
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Why is osmosis important in animals?
- It helps maintain constant internal conditions, and restores balance in the cells
If a cell uses up water in chemical reactions
- the cytoplasm becomes more concentrated and more water immediatly moves in by osmosis
- if too much water moves in, the cell will swell and may burst
If more water is produced in a cells chemical reactions
- The cytoplasm becomes more dilute and water leaves the cell by osmosis
- when water moves out of the cell, theres a risk of the cytoplasm getting too concentrated, shrivel up, and can no longer survive
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Why is osmosis important in plants?
- Plants rely on osmosis to support their stem and leaves
- Water moves into the plant cells causing the vacuole to swell and press the cytoplasm against the cell walls
- This builds up until no more water can enter the cell, making the plant hard and rigid.
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