An American text-book of physiology . e effect of the current is greatest where its density is greatest. The amount of the irritation process developed in a motor nerve is esti-mated from the amount of the contraction of the muscle. The contractionwhich results from closing the current, the closing contraction as it is called,represents the irritating change which occurs at the physiological kathode, whilethe contraction which results from opening the current, the opening contrac-tion, represents the irritating change developed at the physiological there are physiological anodes an
An American text-book of physiology . e effect of the current is greatest where its density is greatest. The amount of the irritation process developed in a motor nerve is esti-mated from the amount of the contraction of the muscle. The contractionwhich results from closing the current, the closing contraction as it is called,represents the irritating change which occurs at the physiological kathode, whilethe contraction which results from opening the current, the opening contrac-tion, represents the irritating change developed at the physiological there are physiological anodes and kathodes under each of the two elec-trodes—the physical anode and physical kathode (see Fig. 26)—four possiblecases may arise, namely: 1. Anodic closing contraction—i. e. the effect of the change developed atthe physiological kathode, beneath the physical anode (the positive pole). 2. Anodic ojjemng contraction—i e. the effect of the change developed atthe physiological anode, beneath the physical anode (the positive pole).. Fig. 26.—Diagram showing physical and physiological anodes and kathodes: ^, the physical anode,or positive electrode; A, the physical kathode, or negative electrode -,0,0,0, physiological anodes; k, k, k,physiological kathodes. 3. Kathodic dosing contraction—i. e. the effect of the change developed atthe physiological kathode, beneath the physical kathode (the negative pole). 4. Kathodic opening contraction—i. e. the effect of the change developed atthe physiological anode, beneath the physical kathode (the negative pole). 64 AN AMERICAN TEXT-BOOK OF PHYSIOLOGY. For convenience these four cases are represented by the abbreviations ACC,AOC, KCC, and KOC. These oases may be arnuigcd in order according to the strengtii of theirritation whicli is developed. Since the irritation process developed at a physiological kathode byclosing a current, is, other things being equal, stronger than that developedat a physiological anode by opening the curren
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