Circannual rhythms in the activity of the parathyroid gland and ultimobranchial body cells of the frog Rana temporaria (Anura, Amphibia) |
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Authors: | H Gevaerts |
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Institution: | Department Chemistry, Biology, Limburgs Universitair Centrum, Diepenbeek, Belgium. |
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Abstract: | The annual activity of the parathyroid gland cells and those of the ultimobranchial body cells of the frog Rana temporaria is quantitatively investigated by a morphometric study. A cosinor analysis shows a periodic succession of different parameters. The secretory activity of the parathyroid cells starts after a maximal value of external temperature in July. This activity is followed by an increase of plasma calcium which seems to induce the activity of the ultimobranchial cells. |
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