Micropuncture of superficial nephrons in avian (Sturnus vulgaris) kidney.

G. Laverty, William H Dantzler

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Single nephron glomerular filtration rate (SNGFR), fluid absorption, and tubule transport of sodium, chloride, calcium, magnesium, potassium, and phosphate were evaluated under control (2.5% mannitol infusion) conditions by micropuncture of superficial, reptilian-type nephrons of European starlings (Sturnus vulgaris). SNGFR averaged 0.36 nl . min-1 . Sodium, chloride, and water were transported at equivalent rates with about 24% of the filtered load absorbed up to the point of micropuncture. Calcium was absorbed continuously along these tubules in excess of sodium and fluid, whereas magnesium appeared to undergo net secretion early and net absorption late in the tubules. Potassium transport varied considerably, with all tubules from a single bird generally showing either net potassium absorption or no net transport. In the latter group, data for a few tubules suggested net potassium secretion. For phosphate, individual tubules from a single bird were capable of either net absorption or net secretion. Mean fractional delivery of phosphate for all tubules was 1.62, but secretion rates apparently can exceed filtration rates for phosphate by as much as 6 times.

Original languageEnglish (US)
JournalThe American journal of physiology
Volume243
Issue number6
StatePublished - Dec 1982

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Nephrons
Punctures
Kidney
Potassium
Phosphates
Glomerular Filtration Rate
Sodium Chloride
Birds
Starlings
Mannitol
Magnesium
Sodium
Calcium
Water

ASJC Scopus subject areas

  • Medicine(all)

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Micropuncture of superficial nephrons in avian (Sturnus vulgaris) kidney. / Laverty, G.; Dantzler, William H.

In: The American journal of physiology, Vol. 243, No. 6, 12.1982.

Research output: Contribution to journalArticle

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