. Advanced lessons in practical physiology for students of medicine. Physiology. MUSCLE AND NERVE 31 at D. 'At the moment when the priiiuuy current is made and broken an induced current is momentarily developed in the secondary coil. 6. Stimulation of Muscle and Nerve—The Condant Current.—Con- nect in scries two dry cells and a sunplc key and apply the ends of the wires leading away from them to the tongue. Make and break the current by closing and opening the key. When do you perceive the stimuli? Note that the make shock is the stronger of the two. Does the current stimulate while it continu
. Advanced lessons in practical physiology for students of medicine. Physiology. MUSCLE AND NERVE 31 at D. 'At the moment when the priiiuuy current is made and broken an induced current is momentarily developed in the secondary coil. 6. Stimulation of Muscle and Nerve—The Condant Current.—Con- nect in scries two dry cells and a sunplc key and apply the ends of the wires leading away from them to the tongue. Make and break the current by closing and opening the key. When do you perceive the stimuli? Note that the make shock is the stronger of the two. Does the current stimulate while it continues to flow, i. e., between the make and break? Upon the basis that a stimulus arises in consequence of any extra- ordinary change in the environment, it may be said that an electric cur-. FiG. 10.—The Automatic Interrupter of the Inductorium (Neef's). A, Entrance of current from battery into post B and vibrator V as far as D. In accordance with the position of the vibrating plate, the current now flows either back to the battery C through post F or into the primary coil PC through D. In the latter case, the current first traverses magnet E before it can reach the battery by way of post F. rent stimulates only when its intensity is rapidly altered. Such altera- tions occur only on the make and on the break of the current, and hence, no stimulation is evoked in between these two points. Inasmuch as the full electric potential is thrown into the living substance on the make of the constant current, the latter reacts with greater amplitude at this time than later on (break), when it has been partially adapted to this stimulus. Single Induction Shocks.—Connect in series two dry cells, a simple key, and posts 1 and 2 of the inductorium. This connection does not include Neef's automatic interruptor, and hence, the current may be made and broken at intervals of varj-ing length. Make and break the. Please note that these images are extracted from scanned page images that may hav
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