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Changes in respiration and enzymic activity were measured in toad bladder tissue and homogenates in response to aldosterone and in rat liver tissue and homogenates in response to corticosterone. The results showed that the stimulation of target tissue may be associated with the saturation of two types of receptor sites for these hormones. The mechanism of action of both hormones is discussed in terms of a common effect on the control of respiration of the target tissue, and a second effect on the control of cellular processes such as the entry of sodium into the epithelial cells of toad bladder or increased transaminase activity in rat liver.
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