. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ION ANTAGONISM 391 muscles after they had been immersed in salt solutions with different CaClo concentrations. TABLE I The Dependence of the Duration of Contractility upon the CaCh Concentration After a previous period of stimulation for five minutes, the muscles were im- mersed in NaCl + KC1 + different CaCl2 concentrations as indicated in this table. After this, stimulation was continued in a moist chamber. No. Cads Concentration Duration CaClz Concentration Duration minutes minutes 1 X 10-4 5 X
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ION ANTAGONISM 391 muscles after they had been immersed in salt solutions with different CaClo concentrations. TABLE I The Dependence of the Duration of Contractility upon the CaCh Concentration After a previous period of stimulation for five minutes, the muscles were im- mersed in NaCl + KC1 + different CaCl2 concentrations as indicated in this table. After this, stimulation was continued in a moist chamber. No. Cads Concentration Duration CaClz Concentration Duration minutes minutes 1 X 10-4 5 X 10-4 > 17 2 i t 5 40. 5 A I X 10-* > 40 3 11 6 81 M X 1CT4 > 15 4 i ( 4 81 M X 10-" > 9 5 i i 4 SIM X 10~4 46 6 t ( 6 81 M X ICT4 20 The experiments with the second method reveal still another fact which seems to be of interest for the problem of the tonus of skeletal muscle. The curves of Fig. 5 in particular show that after the inter-. FIG. 8. Procedure as in Fig. 4. Solutions as in Fig. 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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