An electronmicroscopical study has been carried out on the mitochondriae of transversely striated muscles in birds at experimentally induced hypergravitation. In the matrix of some mitochondriae sporadic small light focuses were observed located mainly at the periphery of the organelle. Thereby, however, no greater damage of the outer membranes was seen. The stress state of hypergravitation resulted in more important and more marked alterations on the inner membranes and the matrix of the mitochondriae of the femoral muscle.
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