Arteriolar and capillary responses to <scp>CO</scp><sub>2</sub> and H<sup>+</sup> in hamster skeletal muscle microvasculature: Implications for active hyperemia
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Objective We hypothesized that CO 2 and H + stimulate capillaries and arterioles to produce local and conducted vasodilations required to coordinate the distribution of blood flow to contracting skeletal muscle fibers. Methods CO 2 and H + independently and in combination were applied to 2A arterioles (first branch order from the 1A feed arteriole) and capillaries of the in situ, blood‐perfused hamster cremaster muscle. The resulting local and conducted vasodilations were measured. Results H + ( pH : 7.2‐6.6) and CO 2 (5% and 10%) applied to the vascular network induced 2A arteriolar vasodilations, while 15% CO 2 produced vasoconstriction. Localized application of H + produced 2A arteriolar vasodilation, while 15% CO 2 resulted in a variable response. Simultaneous application of CO 2 and H + did not result in the predicted additive effects. Application of CO 2 and H + alone or combined on arterioles or capillaries did not induce a conducted response. Conclusions CO 2 and H + produce arteriolar vasodilation but, critically, cannot stimulate the spread of vasodilation throughout the network, thus limiting their ability to coordinating blood flow to contracting skeletal muscle fibers. Given their potential for interaction, the importance of CO 2 and H + may lie in their ability to modify the effects of other vasodilators.
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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