Component
Forearm vasoconstriction to adrenergic stimuli
Independent measured endpoint or substance; model, assay and exposure are retained in each linked finding.
1 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
How nutrients influence it
Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
How nutrients reach it in more than one step
Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.
Tracing routes…
What it does
Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.
What acts on it
Forearm vasoconstriction to intra-arterial norepinephrine and tyramine was greater after repletion; four subjects also had lower resistance-vessel responsiveness to lower-body negative pressure during deficiency.
Experimental context and source evidence
- availability_state
- nutrient_deficiency Imported condition classification; unverified.
- experimental_model
- Five volunteers studied after three months of vitamin C deprivation and again after four months of repletion.
- exposure
- Clinical scurvy; forearm blood flow, pressure, catecholamines and responses to lower-body negative pressure, norepinephrine and tyramine.
- limitations
- Does not isolate endothelial, smooth-muscle or collagen mechanisms.
- nutrient_topic
- Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
- organism
- Homo sapiens
- plain_language
- The blood vessels responded less strongly to some constricting signals during shortage.
- primary_references
- [c-abboud1970] Autonomic reflexes and vascular reactivity in experimental scurvy in man (1970). https://pubmed.ncbi.nlm.nih.gov/5411783/ DOI: 10.1172/jci106239
- tissue_or_cell_type
- Human blood or whole-person endpoints
- trigger_kind
- nutrient_deficiency Imported condition classification; unverified.
Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1529–1539
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Five volunteers studied after three months of vitamin C deprivation and again after four months of repletion. · source_derived_draft · unverified_draft
### c-scurvy-vascular-responsiveness Forearm vasoconstriction to intra-arterial norepinephrine and tyramine was greater after repletion; four subjects also had lower resistance-vessel responsiveness to lower-body negative pressure during deficiency. Condition category: nutrient_deficiency nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: The blood vessels responded less strongly to some constricting signals during shortage. organism: Homo sapiens tissue_or_cell_type: Human blood or whole-person endpoints experimental_model: Five volunteers studied after three months of vitamin C deprivation and again after four months of repletion. limitations: Does not isolate endothelial, smooth-muscle or collagen mechanisms. exposure: Clinical scurvy; forearm blood flow, pressure, catecholamines and responses to lower-body negative pressure, norepinephrine and tyramine. [c-abboud1970] Autonomic reflexes and vascular reactivity in experimental scurvy in man (1970). https://pubmed.ncbi.nlm.nih.gov/5411783/ DOI: 10.1172/jci106239
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.