Active Transport

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Define Active Transport
the movement of molecules from an area of low concentration to an area of high concentration, against the concentration gradient, which requires energy
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What proteins are involved in active transport?
Carrier proteins
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What are the two main different=ces between active transport and facilitated diffusion?
Facilitated diffusion solutes move from high to low concentrations, in active transport they move from low to high, active transport requires energy.
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Where does the energy come from in active transport?
ATP hydrolysis reaction
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What are co-transporters?
A type of carrier protein that bind two molecules at a time
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how does it work?
The concentration gradient of one molecule is used to move the other against its concentration gradient
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What three factors affect active transport?
speed of individual carrier proteins, number of carrier proteins and rate of respiration (ATP)
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In what way is glucose absorbed in the ileum and why?
It is absorbed by co-transport because the concentration is too low to diffuse into the blood
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How does this occur?
Glucose enters the ileum epithelium with sodium ions, these are activley transported out of the epithelium cells into the blood by active transport using the sodium potassium pump, which creates a concentration gradient, causing sodium ions to diffus
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Cont
se intp the epithelial cells from the ileum, by sodium glucose transporter proteins, which also carries glucose with it, so the concentration of glucose inside the cell increases, causing the glucose to diffuse into the blood stream by facilitated
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Cont.
Diffusion.
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Other cards in this set

Card 2

Front

What proteins are involved in active transport?

Back

Carrier proteins

Card 3

Front

What are the two main different=ces between active transport and facilitated diffusion?

Back

Preview of the front of card 3

Card 4

Front

Where does the energy come from in active transport?

Back

Preview of the front of card 4

Card 5

Front

What are co-transporters?

Back

Preview of the front of card 5
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