BRAINCAKEDistal Convoluted Tubule
The distal convoluted tubule (DCT) is the coiled part of the nephron after the ascending limb of the loop of Henle, back in the cortex. It leads into the collecting duct. Filtrate entering the DCT is dilute, because the ascending limb has removed ions but not water.
The DCT makes fine adjustments to the composition of the filtrate, according to the body's needs. Like the PCT, its cells have many mitochondria and microvilli, because they carry out a lot of active transport.
Functions of the DCT:
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Key terms in this lesson
- aldosterone
- A hormone from the adrenal cortex that increases sodium ion reabsorption and potassium ion secretion in the distal convoluted tubule.
- adrenal cortex
- The outer part of the adrenal gland, which secretes hormones such as aldosterone.
- hydrogencarbonate ions
- Ions (HCO3-) reabsorbed by the distal convoluted tubule to help raise blood pH when it is too acidic.
More in Homeostasis
- Selective Reabsorption
- Proximal Convoluted Tubule
- Loop of Henle
- Countercurrent Multiplier
- Collecting Duct
- Urine
- Adaptations
- Control of Osmoregulation
All 41 lessons in Homeostasis · All Edexcel A-level Biology topics