. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ELECTROPHYSIOLOGY OF PROBOSCIDACTYLA 109 2-5 2-0 CD o" O O 55' 1-5 CO CD oo 03 1-0 — O. gastrozooid 1 gastrozooid 2 369 Number of colonial pulse FIGURE 6. Graph to show that fatigue and recovery from fatigue of the colonial pulse system affects all parts of the colony equally. Nine shocks were given randomly to the colony over a period of one minute at a distant stimulating electrode. The time taken for each colonial pulse to reach two gastrozooids is shown. velocity and facilitation. Conduction velocities are not signi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ELECTROPHYSIOLOGY OF PROBOSCIDACTYLA 109 2-5 2-0 CD o" O O 55' 1-5 CO CD oo 03 1-0 — O. gastrozooid 1 gastrozooid 2 369 Number of colonial pulse FIGURE 6. Graph to show that fatigue and recovery from fatigue of the colonial pulse system affects all parts of the colony equally. Nine shocks were given randomly to the colony over a period of one minute at a distant stimulating electrode. The time taken for each colonial pulse to reach two gastrozooids is shown. velocity and facilitation. Conduction velocities are not significantly higher in large diameter stolons. The conducting system for colonial pulses is particularly labile. At a constant stimulation rate of 1 shock/sec the system gives one CP for each shock for between 5 and 60 shocks, then follow periods of firing to alternate shocks, every third, fourth, fifth and sixth shock until the system no longer conducts. This effect can be brought about more rapidly by increasing the rate of stimulation. If a colony is stimulated with repetitive shocks having a frequency greater than 1 every 5 sec, then the conduction velocity of each colonial pulse decreases noticeably until the conducting system becomes inexcitable (Fig. 5). Figure 6 shows that the rate of fatiguing and recovery from fatigue affects all parts of the colony equally. As might be expected the threshold for generating a colonial pulse increases as the preparation fatigues. Colonial pulses continue to be propagated after the colony has been immersed in a solution containing 1 part of sea-water to 1 part of isotonic magnesium chloride for three 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report
Size: 1199px × 2084px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
