THE CALORIGENIC EFFECTS OF SOME THYROXINE ANALOGS ON INTACT ANIMALS AND ON EXCISED TISSUES*

Abstract
The L- and D-isomers of thyroxine and triiodothyronine and their propionic and acetic acid derivatives were studied in thyroidectomized rats. Within moderate dose range, the oxygen consumption of excised liver, kidney, heart, and diaphragm paralleled the change in whole animal''s BMR, although the response of heart was consistently higher than that of the other tissues. Therefore a rise of the heart metabolism may not be reflected by a measurable increase of BMR.

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