the effects of endogenous plasma renin substrate ( prs ) on the relationship between plasma renin activity ( pra ) and the plasma renin concentration ( prc ) have been studied in hyperthyroid rats , by i-triiodothyronine ( t3 ) administration and in hypothyroid rats , by propylthiouracil ( ptu ) treatment , to clarify if pra changes are an adequate index for evaluating the renin-angiotensin changes during the alterations in the thyroid function .
C0041014
triiodothyronine
C0020676
hypothyroid