. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GABA, ANTAGONISTS, AND LIMULUS HEART 385 T H a 10 S 50 100 CABA (M X I0~7) 250 500 FIGURE 3. Relation of relative contraction strength to concentration of GABA perfused through isolated hearts. The solid line is the regression line determined by least squares and the dashed lines represent the standard error of the regression line. of perfused GABA is plotted for 19 perfusions in 13 different hearts. The slope of the regression line in this case is only -- compared to the slope of — for rate changes. T
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GABA, ANTAGONISTS, AND LIMULUS HEART 385 T H a 10 S 50 100 CABA (M X I0~7) 250 500 FIGURE 3. Relation of relative contraction strength to concentration of GABA perfused through isolated hearts. The solid line is the regression line determined by least squares and the dashed lines represent the standard error of the regression line. of perfused GABA is plotted for 19 perfusions in 13 different hearts. The slope of the regression line in this case is only -- compared to the slope of — for rate changes. Thus a concentration of GABA sufficient to reduce heart rate by 50% reduces contraction strength by less than 20%. Although GABA reduces the rate at which rhythmic bursts of electrical activity occur in isolated cardiac ganglia, it causes no readily apparent changes in the pat- tern of the individual bursts. In Figure 4 the pattern of a typical burst of electrical. 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 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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