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Active Transport
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Active Transport

lesson introduction

Active Transport

Active transport moves substances from low to high concentration, and so requires energy.

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This shows what happens in active transport

It's not the same as what happens in osmosis and diffusion.

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True or false? In active transport, particles go from higher concentration to lower concentration.

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In active transport, particles in fact move from lower concentration to higher concentration

They move from when there are already fewer particles to where there are already more particles!

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This is an image of diffusion

Here particles move from higher to lower concentration - the opposite direction to active transport.

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Now, the image also shows the direction of the concentration gradient. Particles in diffusion move _________________ the concentration gradient?

A) in the same direction as B) in the opposite direction to

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Particles in diffusion and osmosis move along the concentration gradient

The concentration gradient is the direction from higher to lower concentration.

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Now, this is an image of active transport again. Particles in active transport move _________ the concentration gradient.

A) along B) against

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In active transport, particles move against the concentration gradient

They go from lower concentration to higher concentration.

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So active transport is in many ways "opposite" to diffusion and osmosis. What do you think we might call osmosis and diffusion with a single term?

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Now, imagine you have to stuff more clothes into a suitcase which is full already. Is this more similar to active transport or passive transport?

A) Active transport B) Passive transport

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Stuffing that clothes into the suitcase will likely make you huff and puff. It requires you to...

A) spend money. B) lie back and relax. C) spend energy.

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Moving against the concentration gradient requires energy

That means that active transport requires energy, as opposed to passive transport, like osmosis and diffusion.

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To recap! In active transport, particles move against the concentration gradient

That means they go from lower concentration to higher concentration.

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Active transport requires energy

Passive transport, like osmosis and diffusion, does not.

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True or false? This image shows an example of active transport.

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True or false? This image shows an example of active transport.

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True or false? This image shows an example of active transport.

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True or false? This image shows an example of active transport.

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Summary! Active transport requires enery

It moves particles against the concentration gradient.

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Example 1

Sugar molecules move from your gut to your blood where there is already a higher concentration of sugar molecules than in the gut.

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Example 2

Ions move from the soil into plant roots where there is already a higher concentration of ions than in the soil.

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