Short communication
Osmoregulation in Hydra: Column contraction as a function of external osmolality

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Abstract

  • 1.

    1. The rate of spontaneous column contractions in fresh-water Hydra is inversely proportional to external osmolality.

  • 2.

    2. Hydra maintain their water balance by periodically eliminating excess water from the enteron through the mouth by contraction of their body column.

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  • L.M Passano et al.

    Co-ordinating systems and behavior in Hydra—I. Pacemaker system of the periodic contractions

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  • M Macklin et al.

    The ionic requirements of transepithial potentials in Hydra

    Biol. Bull., mar. biol. Lab., Woods Hole

    (1971)
There are more references available in the full text version of this article.

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Present address: Department of Physiology and Pharmacology, Duke University Medical Center, Durham, North Carolina 27710.

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