Effect of an increased calcium ion concentration on electrical and contractile activity of the smooth muscles of the guinea pig ureter
โ Scribed by N. G. Kochemasova; V. M. Taranenko
- Publisher
- Springer US
- Year
- 1977
- Tongue
- English
- Weight
- 311 KB
- Volume
- 83
- Category
- Article
- ISSN
- 0007-4888
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๐ SIMILAR VOLUMES
Low calcium concentration in the external medium depolarises the membrane of smooth muscle cells of the ureter and their excitability diminishes. The Ca++ dependent oscillations of the action potential disappears, while the plateau component is more resistent. Analogous reactions are observed by the
Increase of the external K+ concentration depolarises the ureteral muscle membrane and induces, after a transient period of increased spontaneous activity, a tonic contraction. Tetraethylammonium, in concentrations normally required for ganglion blocking activity, does not influence the ureteral act
Zusammen/assung. Wir untersuchten bei den fibrill~ren Flugmuskeln eines Insektes (Lethocerus) die Calciura-induzierte Aktivierung der ATP-ase und der Kontraktion yon Myofibrillen und Actorayosin, den Calciumbedarf und die Bedingungen fiir die Calcium-Aktivierung. 1. Calcium-Ionen aktivieren die ATP