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Effects of nerve cross‐union on rat intracellular potassium in fast‐twitch and slow‐twitch rat muscles
Author(s) -
Hoh J. F. Y.,
Salafsky B.
Publication year - 1971
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1971.sp009516
Subject(s) - potassium , intracellular , chemistry , medicine , anatomy , biophysics , endocrinology , neuroscience , biology , biochemistry , organic chemistry
1. Electrolytes of normal, self‐innervated and cross‐innervated extensor digitorum longus and soleus muscles of rats have been determined. 2. [K] i was 173 m‐equiv/l. for both normal and self‐innervated extensor digitorum longus. In cross‐innervated extensor digitorum longus it was reduced to 159 m‐equiv/l. 3. For normal and self‐innervated soleus, [K] i was 150 m‐equiv/l. and 154 m‐equiv/l. respectively. In cross‐innervated soleus it was increased to 182 m‐equiv/l. 4. The content and distribution of most other electrolytes of cross‐innervated soleus, as well as its weight, were not significantly different from those of controls. On the other hand, cross‐innervated extensor digitorum longus weighed about half as much as controls and contained markedly elevated Na + , Cl − and extrafibre water and reduced non‐collagenous protein and intrafibre water. 5. It is concluded that [K] i of fast‐twitch and slow‐twitch muscle fibres are under neural regulation. Possible mechanisms for this regulation are discussed.