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Download PDF by P. F. Baker: Calcium Movement in Excitable Cells. Pergamon Studies in The

By P. F. Baker

ISBN-10: 0080182984

ISBN-13: 9780080182988

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Sodium-calcium exchange may provide the link between inhibition of the N a pump by ouabain and the rise in cell calcium. This is supported by the ñnding that both uptake of Ca and the attendant rise in respiration require N a ions (Ruscak and Whittam, 1967). The observations of Wollenberger (1947) suggest that the cardiac glycosides may induce a similar Ca accumulation in cardiac muscle. E. Summary of Factors Affecting Intracellular pCa To summarize, the intracellular pCa is determined by the interplay between three factors: (1) the rate of Ca entry across the axolemma, (2) the rate of Ca outflow across the axolemma, and (3) intracellular buffers.

1971) O n the control of glycogenolysis in manmialian nervous tissue by calcium, / . Physiol. Ill, 503-17. LÄNNERGREN, J . (1967) Contractures o f single slow muscle fibres o f Xenopus laevis by potassium, acetyl­ choline or choline. Acta physiol. scand. 69, 362-72. LEHNINGER, A . L . , CARAFOU, E. a n d Rossi, C . S. (1967) Energy-linked ion movements in mitochondrial systems. Adv. Enzymol. 29, 259-320. LESTER, H . A . (1970) Transmitter release by presynaptic impulses in the squid stellate ganglion.

9 pmole/ cm^ sec. 2 pmole/cm^ sec. Thus although maintained depolarization can induce Ca entry, the effect is clearly less than that associated with elec­ trical stimulation. In view of the evidence presented on pages 26-27 that N a - C a counter transport is activated by external Κ ions, it is possible that the bulk of the C a influx from K-rich solutions may reflect K-induced Ca influx in exchange for N a rather than depo­ larization-induced Ca entry. In summary, the tracer data provide clear evidence for Ca uptake associated with nervous 0 ^ 100 200 300 ± AGO m s e c FIG.

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