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Steroid production by quartered and capsular rat adrenal gland in response to haemorrhage.

60 min after rapid bleeding (1.5--2.0 per cent of b. w.) both aldosterone and corticosterone production rate by quartered rat adrenals were found to be elevated. However, no difference was observed in the rate of aldosterone and corticosterone production by capsular adrenals of sham operated and hypovolaemic rats. Corticosterone production rate by decapsulated adrenals was much more higher after haemorrhage than in the control group. The same alterations could be observed incubating adrenal tissue with ACTH (0.3 mug per ml). Steroid production rate by quartered adrenals of sodium deficient rats was not affected by high in vitro concentration of angiotensin II (2.5 mug per ml). It is concluded that the effect of acute blood loss on corticosteroid biosynthesis of the rat is mediated by ACTH alone.