. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 802 Comparative Animal Physiology covery resembles the supernormal period in cardiac mxuscle (Ch. 15). Ex- planations have been suggested as follows: (a) It is difficult to account for this delayed facilitation on the basis of persistence of any chemical transmitter unless it is assumed that a second excitatory substance is liberated. (I?) In nerve fibers the excitability returns during the refractory period and is supernormal during the negative after-potential. Similar enhanced ex- citability can be produced b
. Comparative animal physiology. Physiology, Comparative; Physiology, Comparative. 802 Comparative Animal Physiology covery resembles the supernormal period in cardiac mxuscle (Ch. 15). Ex- planations have been suggested as follows: (a) It is difficult to account for this delayed facilitation on the basis of persistence of any chemical transmitter unless it is assumed that a second excitatory substance is liberated. (I?) In nerve fibers the excitability returns during the refractory period and is supernormal during the negative after-potential. Similar enhanced ex- citability can be produced by cathodal polarization, catelectrotonus. In some nerve centers the late facilitation is at a time of delayed negativity. A rela- tion between reflex facilitation and slow negative potentials in the spinal. (A). 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
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