title: [Distribution of sodium and potassium in avian skeletal muscles].
abstract: Studies have been made on the peculiarities of distribution of Na+ and K+ in functionally different skeletal muscles of 6 species of birds. Comparison of tissue concentration ratio K+/Na+ as well as of distribution coefficients of these ions in tissue and the external medium revealed that selectivity of muscles to K+ and Na+ is related to functional specialization of the contractile mechanism. Dynamic contractile parameters in avian muscles were studied. It was shown that distribution coefficient of K+ and Na+ in muscles is quantitatively related to the velocity of development of isometric contraction. The described dependence between the ionic selectivity of muscle and their morpho-functional characteristics corresponds to the general pattern of this dependence established for skeletal muscles of other Vertebrates.
mesh_terms: D000818:Animals; D001717:Birds; D008297:Male; D009132:Muscles / Q000032:analysis*; D011188:Potassium / Q000032:analysis*; D012964:Sodium / Q000032:analysis*; D013045:Species Specificity
chemical_list: D012964:Sodium; D011188:Potassium
vernacular_title: Osobennosti raspredeleniia natriia i kaliia v skeletnykh myshtsakh ptits