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by ellie__coops14, May 2017

Subjects: Cells

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	Active transport	Substances move from an area of low concentration to an area of high concentration against the concentration gradient. This process requires energy.
	How does it work?	Transporter proteins in a cell membrane, take molecules from an area of low concentration and turns them around to an area of high concentration against the concentration gradient.
	Examples of active transport	Mineral ions: can be moved by active transport from the soil into root hair cells, against the concentration gradient. Glucose: can be absorbed into the blood stream from the gut by active transport against the concentration gradient. Salt: can be pumped out of crocodiles tongued into salt water against the concentration gradient.
	Why is it necessary to absorb some food molecules by actives transport?	Against a concentration gradient, from a low to high concentration.