Requirement of Bound Calcium for the Action of Surface Chemoreceptors

Science  27 Nov 1959:
Vol. 130, Issue 3387, pp. 1474-1476
DOI: 10.1126/science.130.3387.1474


The ability of Hydra to carry out the feeding reflex in response to reduced glutathione was inhibited by either (i) standing in distilled water, (ii) the presence of ethylenediamine tetraacetic acid, or (iii) the presence of magnesium ions. These three types of inhibition were reversed instantaneously by the addition of calcium ions.