. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. "^^,. Fig. 249. Discharge of nematocysts of Anemonia to various stimuli, a, Touch by a human hair, h, Touch by a clear, blunt glass rod fails to cause discharge, c, Response to clean glass rod after sensitization of the cnidoblasts with dilute saliva extract, d, Response to glass rod smeared with alcohol extract of Pecten gill. From Pantin.^" discharge to the specific region excited.^^' ^* Intense mechanical stimulation by inert objects will induce only a weak discharge, whereas mild mechanical stimula
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. "^^,. Fig. 249. Discharge of nematocysts of Anemonia to various stimuli, a, Touch by a human hair, h, Touch by a clear, blunt glass rod fails to cause discharge, c, Response to clean glass rod after sensitization of the cnidoblasts with dilute saliva extract, d, Response to glass rod smeared with alcohol extract of Pecten gill. From Pantin.^" discharge to the specific region excited.^^' ^* Intense mechanical stimulation by inert objects will induce only a weak discharge, whereas mild mechanical stimulation by natural foods is sufficient to evoke a strong response (Fig. 249). Submersion of cnidoblasts in a weak extract of a normal food which will typically not itself induce discharge will greatlv lower the threshold of these effectors in Anemonia to purely mechanical stimuli.^^ The specific food factors that are involved in this sensitization are lipoidal substances adsorbed upon proteins. The adsorptive forces are so strong that the factors cannot be removed by ether extraction, but thev can be with alcohol. The active chemical substances appear to have properties resembling sterols and phos- pholipins and to be highly surface-active. In view of the rapid and thorough discharge of nematocysts even to dried foods, it would appear that the nor- mal reaction must be "contact-chemical" in character, chemical sensitization to mechanical stimulation occurring almost Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prosser, C. Ladd (Clifford Ladd), 1907-; Bishop, David W. Philadelphia, Saunders
Size: 1285px × 1944px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisher, booksubjectphysiologycomparative
