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Learn: Cell Transport Mechanisms
AQA GCSE Biology 8461 specification
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Welcome!Building on what you've already learned about cell structure, let's explore how substances move in and out of cells. This will help us understand processes like diffusion and active transport!
What is Cell Transport?Cell transport refers to the movement of substances like nutrients, oxygen, and waste into and out of cells. It is vital for maintaining the functions of the cell and supporting life processes.
DiffusionDiffusion is the movement of particles from an area of high concentration to an area of low concentration. It happens because particles spread out to balance their concentration. This process does not require energy.
Quick check: Which of these is an example of diffusion?
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OsmosisOsmosis is the movement of water through a partially permeable membrane from a region of higher water concentration to a region of lower water concentration. It helps maintain cell hydration and balance.
Osmosis is the movement of {{blank0}} through a {{blank1}} membrane.
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Active TransportActive transport is the movement of substances against their concentration gradient, from low to high concentration. This process requires energy from respiration because it goes against the natural flow.
Match the items on the left with their correct pairs on the right
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Review Time!Great work! You've learned about diffusion, osmosis, and active transport. Now let's test your understanding with a few questions.
Which of the following are true? (Select all that apply)
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Which process moves substances against their concentration gradient?
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Diffusion is the movement of particles from {{blank0}} concentration to {{blank1}} concentration.
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Match the items on the left with their correct pairs on the right
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