Summary
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1.
The antidiuretic activity of the corpora cardiaca-corpora allata extract is destroyed by heat.
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2.
Hormone stimulated water transport across the rectal wall will occur only if Na+ is present in the medium bathing the basal (haemocoel) surface.
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3.
Osmotic flow of water into the rectal lumen can be reversed by the gland extract.
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4.
Removal of Na+ from the basal surface has no effect on inward or outward osmotic flow of water across the unstimulated rectal wall.
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5.
The antidiuretic effect of the gland extract is blocked by 2 mM ouabain.
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6.
Dibutyryl cyclic AMP (1 mM) increases water transport across the rectal wall but is only 50–75% as effective as the gland extract.
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7.
Recta taken from dehydrated cockroaches transport water more rapidly than those taken from hydrated individuals. The difference disappears if Na+ is omitted from the bathing medium.
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Steele, J.E., Tolman, J.H. Regulation of water transport in the cockroach rectum by the corpora cardiaca-corpora allata system: The requirement for Na+ . J Comp Physiol B 138, 357–365 (1980). https://doi.org/10.1007/BF00691570
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DOI: https://doi.org/10.1007/BF00691570