Diffusion is the overall movement of particles from an area of higher concentration to an area of lower concentration
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In which states of matter can diffusion occur in and why?
Diffusion can happen in liquids and gases because the particles are able to move freely in these substances
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What kind of molecules can diffuse through cell membranes?
Only small molecules can diffuse through cell membranes; for example, glucose, amino acids, water and oxygen
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What is osmosis?
Osmosis is the net (overall) movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration
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What is a partially permeable membrane?
A partially permeable membrane is one with very small holes in it
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What is active transport?
Active transport is the movement of particles across a membrane against a concentration gradient (i.e. from an area of lower to an area of higher concentration) using energy transferred during respiration
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Why is active transport important?
In the digestive system nutrients in the gut diffuse naturally into the blood but sometimes there's a lower concentration of nutrients in the gut than in the blood so active transport allows nutrients to be taken into the blood
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Why is energy required for active transport?
Energy is needed for active transport because it works against a concentration gradient and so it moves particles the wrong way
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How can you find out the percentage change?
Percentage change= (final mass - initial mass/initial mass) x 100
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Other cards in this set
Card 2
Front
In which states of matter can diffusion occur in and why?
Back
Diffusion can happen in liquids and gases because the particles are able to move freely in these substances
Card 3
Front
What kind of molecules can diffuse through cell membranes?
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