Selective reabsorption

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How are cells lining the proximal convoluted tubule specialised for reabsorption?
Microvilli, mitochondria, sodium-potassium pumps, co-transporter proteins.
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How are microvilli formed and what is their purpose?
Cell surface membrane in contact with tubule fluid is highly folded to form microvilli which increase SA for reabsorption.
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Where are co-transporter proteins found and what do they do?
Found in the membrane. They transport glucose/amino acids in association with sodium ions from the tubule into the cell (facilitated diffusion).
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Where are the sodium-potassium pumps and what is their job?
Opposite membrane is also folded to increase SA and contains sodium-potassium pumps which pump sodium ions out of the cell and potassium ions into the cell.
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Where are mitochondria found and what do they do?
Found in the cell cytoplasm. They produce a lot of ATP.
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What happens as glucose and amino acid concentrations rise inside the cell?
These substances are able to diffuse out of the opposite side of the cell into the tissue fluid. They can then diffuse into the blood and be carried away.
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How are larger molecules such as small proteins that may have entered the tubule be reabsorbed?
By endocytosis.
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Other cards in this set

Card 2

Front

How are microvilli formed and what is their purpose?

Back

Cell surface membrane in contact with tubule fluid is highly folded to form microvilli which increase SA for reabsorption.

Card 3

Front

Where are co-transporter proteins found and what do they do?

Back

Preview of the front of card 3

Card 4

Front

Where are the sodium-potassium pumps and what is their job?

Back

Preview of the front of card 4

Card 5

Front

Where are mitochondria found and what do they do?

Back

Preview of the front of card 5
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