Movement across membranes

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9 Terms

1
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What is diffusion?
the net movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient
2
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How do smells spread?
by diffusion
3
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How do smells spread by diffusion?
particles are constantly moving past eachother in random directions which cause and overall movement of particles from where there are more of them (higher concentration) to where there are fewer of them (a lower concentration)
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What is a concentration gradient?
the difference in concentration between two areas
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What molecules enter and leave cells due to diffusion through the cell membrane?
small molecules - oxygen and carbon dioxide, glucose, amino acids
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What affects the rate of diffusion
Temperature, concentration gradient, surface area of cell membrane
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What is the definition of osmosis?
the net movement of water molecules from an area of high water concentration to an area of low water concentration through a partially permeable membrane
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What do cell membranes trap?
large molecules
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Percentage change in mass calculation
final mass - initial mass

\-------------------------- X100

initial mass