American journal of physiology (1898) (14596520250)

Identifier: americanjourna04ameruoft (find matches)
Title: American journal of physiology
Year: 1898 (1890s)
Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings
Subjects: Physiology Physiology
Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto



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chlorideequimolecular with a 0.7 per cent sodium chloride solution. Sincethe results were obtained from a study of a number of strips fromdifferent hearts, allowance must be made for individual differences 278 D. J. Lingle. \\\ tissue. I think the results numerous enough, however, to permita rough generahzation to be made. TABLE II. Solution 1. 49. 2. 49 3. 48. 4. 48 5. 47. 6. 47 7. 46 8. 45 9. 44 10. 43 11. 42 12. 41 49.5 c.c. NaCl + 0.5 c.c. CaCl.,. c.c. NaCl + 1 c.c. CaCl.,..5 c.c. NaCl + 1.5 c.c. CaCl.2. c.c. NaCl + 2 c.c. CaCU..5 c.c. NaCl + 2.5 c.c. CaCU. c.c. NaCl + 3 c.c. CaCU. c.c. NaCl + 4 c.c. CaCU. c.c. NaCl + 5 c.c. CaCU. c.c. NaCl 4- 6 c.c. CaClo. c.c. NaCl + 7 c.c. CaCL. c.c. NaCl 4-8 c.c. CaCU. c.c. NaCl+ 9 c.c.CaCU. Beats stronger and rhythm longer than inNaCl solution. j Rhythm was best in these solutions, was( most regular, and lasted longest withI good force in the beats. I Rhythm nearly the same as in NaCJ I solution. ) (■ Rhythm not so good as in NaCl solution.
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11.52 11.54CaCU Na2S04 11.58CaClg 12.05NaSO. Figure 6. — Shows how a solution of CaCU, equimolecular with 0.7 per cent NaCl willstop rhythmic activity. The tracing also shows how activity thus stopped can berestored by precipitating the calcium with a solution of Na2S04 equimolecular with0.7 per cent NaCl. The action of calcium presents another point of interest. Calciumhas the power to stop the action of a beating strip. This standstillcan be removed by transferring the strip to a solution of puresodium chloride or by precipitating the excess of calcium withsodium sulphate. In Fig. 6 is shown the action of sodium sulphate.A powerfully beating strip was stopped at 11.52 by the action ofcalcium chloride. At 11.54 it was treated with sodium sulphate, insolution equimolecular with 0.7 per cent sodium chloride, and at11.55 beats reappeared. The result can be secured a number oftimes in succession. This action is analogous to that of atropin and The Action of Certain Ions on Ventricular