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• W3128249265 abstract "Abstract Oxygen (O 2 ) transport through diffusion from capillary to tissue has long been established by Krogh. However, the interstitial fluid in the interspace between tissue and capillary has a high Prandtl number around 10 3 and hence its convective mass transport is more efficient than its diffusive transport. The interstitial flow drained by the initial lymphatics contributes to the convective transport of O 2 through tissue, which can be modeled as aligned blood capillaries in parallel and the initial lymphatics. It is found that both the O 2 concentration distribution and the total O 2 flux are sensitive to the flow rate of interstitial fluid. The convection contribution has been evaluated based on the Peclet number, feature flow rate, and convection-diffusion boundary. At the same interstitial flow rate, convection delivers more O 2 to type I muscle fibers with a higher concentration of myoglobin than to type IIX muscle fibers. Even with a small external force, tissue with a higher specific hydraulic conductance (permeability) has a larger interstitial flow rate and a higher O 2 transport rate than those in healthy tissue. Hence, the overall O 2 transport from capillary to tissue includes two components, i.e., active convection transport by interstitial flow due to pressure gradient and passive diffusion transport due to concentration gradient. The active convective O 2 transport is crucial for the recovery of damaged tissue where the contribution from passive diffusion transport is constrained by regulation of capillary opening. The convection facilitated O 2 transport can be the basis for cell differentiation, morphogenesis, and therapeutic effects of massage and acupuncture. Key points Interstitial flow plays a key role in active O 2 transport in tissue due to its high Prandtl number v / D ~10 3 ; O 2 transport in tissue is balanced by both active convection and passive diffusion transport. Interstitial flow in form of active convective transport can pump more than hundred times of O 2 into tissue than those by passive diffusion transport due to the concentration gradient. Active convection transport can be triggered by external pressure, which is crucial for damage tissue recovery." @default.
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• W3128249265 date "2021-01-30" @default.
• W3128249265 modified "2023-10-17" @default.
• W3128249265 title "Active oxygen transport in tissue by interstitial flow" @default.
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• W3128249265 doi "https://doi.org/10.1101/2021.01.28.427630" @default.
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