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Zusammenfassung:
The rectal gland of the dogfish is specialized for the secretion of sodium chloride. The secretion is controlled by peptide hormones such as, for example, vasointestinal peptide. The mechanism of sodium chloride secretion is apparently similar to that present in mammalian epithelia such as the colon and trachea. This essay discusses the basic principle of sodium chloride secretion in the rectal gland and the mechanism of its hormonal control.