. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MYTILUS MUSCLE RKCKITOKS 163. FIGURE 2. Schematic drawing of stimulating system. Abbreviations are: ABP, author built preamplifier; by, byssus threads; d, modified speaker's drive; FT, force transducer; MS, modified speaker; n, nonelastic cord; r, recording electrodes; wi, water in; wo, water out; and WSG, wavetek signal generator. All electrophysiological recordings were amplified and then stored on a tape recorder. Conditioned data were then fed into a computer of average transients (signal averager) which produced synchro
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MYTILUS MUSCLE RKCKITOKS 163. FIGURE 2. Schematic drawing of stimulating system. Abbreviations are: ABP, author built preamplifier; by, byssus threads; d, modified speaker's drive; FT, force transducer; MS, modified speaker; n, nonelastic cord; r, recording electrodes; wi, water in; wo, water out; and WSG, wavetek signal generator. All electrophysiological recordings were amplified and then stored on a tape recorder. Conditioned data were then fed into a computer of average transients (signal averager) which produced synchronized stimulus histograms, or viewed directly on a strip-chart recorder or a storage oscilloscope. Measurement of a mussel's overall length was used for classification purposes instead of the ABRM's length because the preparation did not permit direct measurement of the ABRM's length. RESULTS Mechanical stimulation of an ABRM. neurally isolated except for its innervating visceral nerves and a portion of the CPC nerve, caused a multiunit discharge of impulses in the isolated CPC" nerve, recorded by the platinum electrodes. In order to determine the best stimulating frequency for further experimenta- tion, the tension on the ABRM was varied sinusoidally around a mean value which was greater than the peak-to-peak (ppk) value of the sinusoid. Mussels of the same size were studied. Simultaneous, averaged records of tension and electrical activity of the mechanoreceptors over fifty cycles of each frequency were compiled by a signal averager. It was found that a mechanical stimulus produced the largest response of the mechanoreceptors. A mechanical stimulus is too fast for the sensory system to respond to, while a -Hz mechanical stimulus is too slow, not yielding a response over the background noise of the CPC nerve's spontane- ous discharges. The activity of the mechanoreceptors due to a mechanical stimulus was not as large as the activity due to a
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
