USMLE Step 1 Renal Physiology 1 Review 58 22 Distal Convoluted Tubule Reabsorption

USMLE Step 1 Renal Physiology 1 Review 58 22 Distal Convoluted Tubule Reabsorption

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Play USMLE Audio MP3 58 22 Distal Convoluted Tubule Reabsorption Below

Begin 58 22 Distal Convoluted Tubule Reabsorption Transcription

What three substances does the distal convoluted tubule reabsorb? Two start with C and one starts with S.

  • Chloride, calcium, and sodium are reabsorbed in the distal convoluted tubule.

The calcium reabsorption is under the control of what hormone?

  • Parathyroid hormone or PTH.

What percent of sodium is reabsorbed in the distal convoluted tubule?

  • Twelve percent.

What is secreted by the late distal tubule and the collecting duct?

  • It starts with a P. Potassium.

The reabsorption of what substance constitutes the chief active transport process in all segments of the nephron?

  • Sodium.

What ion pump drives sodium reabsorption throughout the nephron?

  • The sodium/potassium adenosine-triphosphatase pump drives sodium reabsorption.

Where is this enzyme localized?

  • In the basolateral membranes.

Student doctor, please pause the tape and summarize what we’ve discussed about tubular transport in the distal tubule and the collecting duct, as well as what drives sodium reabsorption all along the nephron.

Chloride, calcium, and sodium are reabsorbed in the distal convoluted tubule. The calcium reabsorption is under the control of parathyroid hormone or PTH. Twelve percent of sodium reabsorption occurs in the distal convoluted tubule. Potassium is secreted by the late distal tubule and the collecting duct. The reabsorption of sodium constitutes the chief active transport process in all segments of the nephron. The sodium/potassium adenosine-triphosphatase pump drives sodium reabsorption throughout the nephron. This enzyme is localized in the basolateral membranes.

****END OF TRANSCRIPTION****

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