4.4 & 4.6- Active transport & Co-transport and absorption of glucose in the ileum

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  • Created by: Megan2413
  • Created on: 14-12-16 19:35
What is active transport?
The movement of molecules or ions into or out of a cell from a region of low concentration to high concentration using energy from ATP
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Why is active transport described as an active process?
It uses energy from ATP
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What types of proteins are involved in active transport?
Carrier proteins
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Explain how active transport works in 1-5 steps
- Molecule or ion binds to the binding site of the carrier protein - On the inside of the cell or organelle, ATP binds to the carrier protein, causing it to split into ADP and Pi - Carrier protein chnages shape due to Pi molecule - The molecule or
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ion is released at the other side of the carrier protein - The Pi molecules is released, reverting the carrier protein back to its original shape
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What happens to the Pi molecule once it has been released from the carrier protein?
It recombines with ADP to make ATP again during respiration
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Explain what the sodium-potassium pump is
Sodium ions are actively removed from the cell/organelle while potassium iosn are actively taken in from the surroudnings
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How does glucose enter the epithelial cell from the lumen of the ileum?
By co-transport
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How does the co-transportaion of Na+ ions and glucose molecules work?
The Na+ ion moves down its concentration and transports glucose with it- the glucos creates a concentration gradient
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How is the Na+ concentration gradient achieved for co-transportation?
By the sodium-potassium pump
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What type of transport is usd to transport Na+ ions out of the epithelial cells into the bloodstream?
Active transport
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How is glucose transported from inside the epithelial cell to the bloodstream?
By facillitated diffusion
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Does glucose travel down its concentration gradient into the bloodstream from the epithelial cell?
Yes
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Why is this example of co-transportation an example of indirect active transport?
Glucose is able to travel against its concentration gradient due to the concentration gradient of the Na+ ions, rather than direct use of ATP to power the movement
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Card 2

Front

Why is active transport described as an active process?

Back

It uses energy from ATP

Card 3

Front

What types of proteins are involved in active transport?

Back

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Card 4

Front

Explain how active transport works in 1-5 steps

Back

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Card 5

Front

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