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Renal clearance experiments were performed on herring gull (Larus argentatus) and great black-backed gull chicks (L. marinus) to test the importance of parathyroid hormone (PTH), parathyroidectomy (PTX), and calcium loading on excretion patterns of sodium, potassium, calcium, and phosphate. PTX reduced the relative clearance of phosphate to near zero within 2 h. Conversely, PTH stimulated net secretion of phosphate within 40 min. Calcium loading caused a drop in phosphate excretion identical to that of PTX, presumably by inhibiting PTH secretion by the parathyroid glands. This also could be reversed by administration of PTH. Serum phosphate values were highest in PTX gulls and lowest in calcium-loaded gulls. The relative clearance of calcium (CCa/CIn) was elevated in calcium-loaded birds. However, CCa/CIn did not change significantly in response to either PTX or PTH in the sham-operated or PTX birds. Serum calcium values were highest in calcium-loaded gulls and lowest in PTX gulls, the reciprocal of the effects on serum phosphate.
N B Clark, and
L L Mok
August 1991,
The Journal of experimental zoology,
N B Clark, and
L L Mok
September 1980,
The American journal of physiology,
N B Clark, and
L L Mok
October 1976,
The American journal of physiology,
N B Clark, and
L L Mok
February 1975,
Endocrinology,
N B Clark, and
L L Mok
November 1969,
Metabolism: clinical and experimental,
N B Clark, and
L L Mok
November 1990,
Archives of disease in childhood,
N B Clark, and
L L Mok
May 1970,
Ceskoslovenska pediatrie,
N B Clark, and
L L Mok
June 1977,
Canadian journal of physiology and pharmacology,
N B Clark, and
L L Mok
July 1970,
Nihon Naibunpi Gakkai zasshi,
N B Clark, and
L L Mok
January 1970,
The Mount Sinai journal of medicine, New York,
