Osmotic regulation in hydra: Sodium and calcium localization and source of electrical potential
Version of Record online: 4 FEB 2005
Copyright © 1967 Wiley-Liss, Inc.
Journal of Cellular Physiology
Volume 70, Issue 2, pages 191–196, October 1967
How to Cite
Macklin, M. (1967), Osmotic regulation in hydra: Sodium and calcium localization and source of electrical potential. J. Cell. Physiol., 70: 191–196. doi: 10.1002/jcp.1040700209
- Issue online: 4 FEB 2005
- Version of Record online: 4 FEB 2005
- Manuscript Accepted: 13 SEP 1967
- Manuscript Received: 15 AUG 1967
Ca45 and Na22 radioautographs using freeze-substitution with 2-ethoxyethanol have been prepared for hydra. They reveal a heavy accumulation of Ca and Na along the mesoglea. Microelectrode probes indicate that the positive resting potential in the hydra gut may be resolved into a series of three steps. These results in hydra epithelium suggest that hydra concentrate ions across the outer epidermal cell layer in much the same way that Na is transported across frog skin.