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A-Level Biology OCR A

Roles Distal Convoluted Tubule Balancing Salt Describe Explain

The distal convoluted tubule balances the body's water and salt levels and helps regulate blood pH. Its wall's permeability changes with ADH, and its cells have mitochondria for active sodium transport.

The distal convoluted tubule regulates water and salt balance and blood pH. Its permeability to water varies with ADH levels, and its cells contain mitochondria for active transport of sodium ions when salt is needed.

Front Describe the roles of the distal convoluted tubule and explain how it can perform these roles.
Back Distal convoluted tubule:
  • Roles - balancing water & salt needs of the body, balancing pH of the blood
  • Permeability of walls of tubules varies with ADH levels - urine concentration can be adjusted
  • Cells lining the tubule have many mitochondria for active transport of sodium ions if body lacks salt

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