Organ

An organ is a multi-typed sub-colimit of tissues realizing a coherent function: a τ-categorical sum of distinct Cell-Fate fixed points whose composition closes a higher-level metabolic, source, closure, or consumer-mixer sub-loop within the organism.

Categorical invariant. Multi-typed sub-colimit of tissues; functionally coherent sub-diagram in Multicellularity-as-Colimit closing a sector-level operation.

Primary registry anchor: VI.D48

Supporting items: VI.D44, VI.D20, VI.D31, VI.D84

1. I.K0 — Universe Postulate
2. VI.D15 — Life Sector
3. VI.D84 — Cell Fate — multiple fates coexist within an organ
4. VI.D44 — Inter-Sector Web allows distinct sectors to interlock at organ scale
5. VI.D48 — Multicellularity as Colimit — organ is a multi-typed sub-colimit
6. VI.D20 — Consumer Mixed Sector — organs in animals realize the mixed-sector base extension

Biomarker: Spatially organized assembly of multiple tissue types with shared vasculature/innervation; a defined parenchyma-stroma boundary; functional hallmarks (e.g., glomerular filtration in kidney, alveolar gas exchange in lung, contractile output in heart).

Measurable range: Organ mass 1 g (parathyroid) to ~1.5 kg (liver, brain); cell-type count 5-50 distinct types; vascular density 1-5% of organ volume.

Observation method: Macroscopic dissection, MRI/CT, organ-level perfusion physiology, organ-on-chip models, single-cell atlas (Tabula Muris/Sapiens), spatial transcriptomics.

Calibration anchor: LG-Y02-kinetic-pseudoscalar-channel

Anchor chain:

1. VI.L18 chirality channel (life anchor)
2. organ left-right asymmetry (heart leftward, liver rightward, gut coiling)
3. morphogenesis of L-R asymmetry traces back to cellular homochirality

Manuscript reference: manuscript-sources/book-06/part06/ch34-eukarya-regime.tex

Status: Planned

Related glossary entries

• LG-S10-tissue Tissue
• LG-S01-cell The Cell

Referenced by

• LG-S12-organism Organism
• LG-S13-multicellularity Multicellularity
• LG-S15-neural-architecture Neural Architecture