Abstract
Equilibration and washout curves of inulin were determined in isolated rat papillary muscles. Inulin uptake did not reach a steady-state value even after a long equilibration time. The effects of contractile activity were investigated. Isometric contractions increased the rate of inulin uptake and washout. In isotonic conditions, a smaller increase in the uptake and washout was observed. These changes could be attributed to an actual increase of inulin distribution space and/or to an accelerated diffusion kinetics.
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