Evidence for role of capillaries in regulation of skeletal muscle oxygen supply
Why this work is in the frame
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Bibliographic record
Abstract
Abstract How oxygen (O 2 ) supply to capillaries is regulated to match the tissue's demand is unknown. Erythrocytes have been proposed as sensors in this regulatory mechanism since they release ATP, a vasodilator, in an oxygen saturation (SO 2 )‐dependent manner. ATP causes hyperpolarization of endothelial cells resulting in conducted vasodilation to arterioles. Objective We propose individual capillary units can regulate their own O 2 supply by direct communication to upstream arterioles via electrically coupled endothelium. Methods To test this hypothesis, we developed a transparent micro‐exchange device for localized O 2 exchange with surface capillaries of intact tissue. The device was fabricated with an O 2 permeable micro‐outlet 0.2 × 1.0 mm. Experiments were performed on rat extensor digitorum longus (EDL) muscle using dual wavelength video microscopy to measure capillary hemodynamics and erythrocyte SO 2 . Responses to local O 2 perturbations were measured with only capillaries positioned over the micro‐outlet. Results Step changes in the gas mixture %O 2 caused physiological changes in erythrocyte SO 2 , and appropriate changes in flow to offset the O 2 challenge if at least 3–4 capillaries were stimulated. Conclusion These results support our hypothesis that individual capillary units play a role in regulating their erythrocyte supply in response to a changing O 2 environment.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it