# Homeostasis
## MicroSim spec
- **Recommended sim type:** [[Control_system|control system]]
- **Microsimmability score:** 86/100
- **Layout:** drawing region (canvas) on top; control region (sliders/buttons) below.
### Parameters (tunable controls)
- `Setpoint`
- `Gain`
- `Disturbance`
### What animates
A regulated variable returns toward its setpoint after disturbances as gain changes.
### Learning objective
Show how [[Negative_feedback|negative feedback]] holds a variable near its setpoint.
## Links (Wikipedia order)
<!-- injected from _registry/childlinks/Homeostasis.json (2026-07-30T02:09:12Z) -->
`2-Arachidonoylglycerol` · `Abiogenesis` · `Academic_Press` · `Acclimatization` · `Acidosis` · `Acid–base_disorder` · `Acid–base_homeostasis` · `Actuary` · [[Adaptation]] · `Adenoma` · `Adenosine_triphosphate` · `Adipose_tissue` · `Adrenal_cortex` · `Adrenal_medulla` · `Aerobiology` · `Afferent_nerve_fiber` · `Agricultural_science` · `Agronomy` · `Agrostology` · `Albedo` · `Alcoholic_ketoacidosis` · `Aldosterone` · `Alkalosis` · `Allostasis` · `Alpha_globulin` · `Amino_acid` · `Anandamide` · `Anatomy` · `Ancient_Greek` · `Anemia` · `Angiotensin` · `Angiotensin-converting_enzyme` · `Animal` · `Anthropology` · `Antonio_Damasio` · `Aorta` · `Aortic_arch` · `Apnea` · `Apoptosis` · `Appetite` · `Arachidonic_acid` · `Archaea` · `Arterial_blood` · `Arterial_tree` · `Astrobiology` · `Atom` · `Atrial_natriuretic_peptide` · `Autonomic_nervous_system` · `Autopilot` · `Bacteria` · `Bacteriology` · `Baroreceptor` · `Baroreflex` · `Bicarbonate_buffer_system` · `Bile_acid` · `Biochemistry` · `Biocoenosis` · `Biodiversity` · `Biogeochemical_cycle` · `Biogeography` · `Biogeology` · [[Bioinformatics]] · [[Biological_engineering]] · `Biological_interaction` · `Biological_organisation` · [[Biological_system]] · `Biologist` · `Biology` · `Biomass` · `Biome` · `Biomechanics` · `Biomedical_sciences` · `Biophysics` · `Biosemiotics` · `Biosphere` · `Biostatistics` · `Biotechnology` · `Blood_gas_tension` · `Blood_pressure` · `Blood_sugar_level` · `Blood_sugar_regulation` · `Blood_volume` · `Body_water` · `Bone` · `Bone_marrow` · `Bone_mineral` · `Bone_resorption` · `Botany` · `Bradycardia` · `Brain` · `Brainstem` · `Breathing` · `British_English` · `Calcitonin` · `Calcitriol` · [[Calcium]] · `Calcium_metabolism` · `Cannabinoid` · `Cannabinoid_receptor` · `Carbohydrate` · `Carbon_dioxide` · `Carbonic_acid` · `Carbonic_anhydrase` · `Carotid_sinus` · `Cell_(biology)` · `Cell_biology` · `Cell_cycle` · `Cell_growth` · `Cell_membrane` · `Cell_signaling` · `Cell_theory` · `Cellular_microbiology` · `Cellular_respiration` · `Central_nervous_system` · `Centrifugal_governor` · `Cerebral_autoregulation` · `Cerebrospinal_fluid` · `Chemical_biology` · `Chemical_bond` · [[Chemical_element]] · `Chemical_plant` · [[Chemistry]] · `Cholinergic` · `Chronobiology` · `Circadian_rhythm` · `Circulatory_system` · `Citric_acid_cycle` · `Claude_Bernard` · `Climate` · `Climate_change` · `Cloud_condensation_nuclei` · `Cognitive_biology` · `Collagen` · `Collecting_duct_system` · `Common_carotid_artery` · `Common_name` · `Community_(ecology)` · `Comparative_biology` · `Computational_biology` · `Concentration` · `Conservation_biology` · `Contraction_alkalosis` · [[Control_system]] · `Countercurrent_exchange` · [[Cruise_control]] · `Cryobiology` · [[Cybernetics]] · `Cytogenetics` · `DNA` · `Death` · `Dehydration` · `Dendrology` · `Depolarization` · `Developmental_biology` · `Diabetic_ketoacidosis` · `Diarrhea` · `Dictionary.com` · `Dieting` · `Dimethyl_sulfide` · `Distal_convoluted_tubule` · `Dizziness` · `Docosahexaenoic_acid` · `Duodenum` · `Earliest_known_life_forms` · `Ecological_genetics` · `Ecological_niche` · [[Ecology]] · [[Ecosystem]] · `Ecosystem_ecology` · `Effector_(biology)` · `Effector_cell` · `Effects_of_high_altitude_on_humans` · `Eicosapentaenoic_acid` · `Electrochemical_gradient` · `Electrolyte` · `Electrolyte_imbalance` · `Embryology` · `Embryophyte` · [[Emergence]] · `Enantiostasis` · `Endocrine_gland` · `Endocrine_system` · `Endothelium` · [[Energy]] · `Energy_homeostasis` · `Enterohepatic_circulation` · `Enzyme` · `Epidemiology` · `Epidermis_(botany)` · `Epigenetics` · `Erythropoietin` · `Eukaryote` · [[Evolution]] · `Evolutionary_biology` · [[Evolutionary_developmental_biology]] · `Extracellular_fluid` · `Farnesoid_X_receptor` · `Feces` · `Fermentation` · `Flower` · `Fluid_balance` · `Freediving` · `Freshwater_biology` · `Function_(biology)` · `Fungus` · `GABA` · `GLUT4` · `Gaia_hypothesis` · `Gas_exchange` · `Gene_expression` · `Gene_flow` · `Genetic_disorder` · `Genetic_drift` · `Genetics` · `Genome` · [[Genomics]] · `Geobiology` · `Gerontology` · `Gland` · `Glossary_of_biology` · `Glucagon` · `Gluconeogenesis` · `Glucose` · `Glycine` · `Glycogen` · `Glycogenolysis` · `Glycolysis` · `Ground_tissue` · `Habitat` · [[Health_technology]] · `Heart_failure` · `Hematocrit` · `Hemoglobin` · `Hemostasis` · `Henderson–Hasselbalch_equation` · `Herpetology` · `High_anion_gap_metabolic_acidosis` · `Histology` · `History_of_biology` · `History_of_life` · `Homeorhesis` · `Homeostatic_feeling` · `Homeostatic_plasticity` · `Hormesis` · `Hormone` · `Human_biology` · `Human_body_temperature` · `Human_digestive_system` · `Human_evolution` · `Human_iron_metabolism` · `Hyperchloremic_acidosis` · `Hyperglycemia` · `Hypernatremia` · `Hyperparathyroidism` · `Hypertension` · `Hyperthermia` · `Hyperventilation` · `Hypocalcemia` · `Hypoglycemia` · `Hyponatremia` · `Hypotension` · `Hypothalamic–pituitary–adrenal_axis` · `Hypothalamic–pituitary–gonadal_axis` · `Hypothalamic–pituitary–thyroid_axis` · `Hypothalamus` · `Hypothermia` · `Hypotonic_hyponatremia` · `Hypovolemia` · `Ichthyology` · `Immune_system` · `Immunology` · `Index_of_biology_articles` · [[Information_theory]] · `Insulin` · `Internal_carotid_artery` · `Internal_environment` · `Introduction_to_evolution` · `Introduction_to_genetics` · [[Ion]] · `James_Lovelock` · `James_Watt` · `Jean-François_Lyotard` · `Jejunum` · `Joseph_Barcroft` · `Journal_of_Endocrinological_Investigation` · `Juxtaglomerular_apparatus` · `Juxtaglomerular_cell` · `Ketoacidosis` · `Kidney` · `Kidney_failure` · `Lactic_acid` · `Lactic_acidosis` · `Le_Chatelier's_principle` · `Leaf` · `Lenz's_law` · `Leptin` · `Life` · [[Limiting_factor]] · `Lipid` · `Lipidology` · `List_of_biologists` · `List_of_biology_awards` · `List_of_biology_journals` · `List_of_research_methods_in_biology` · `List_of_unsolved_problems_in_biology` · `Liver` · `Liver_failure` · `Loop_of_Henle` · `Macroevolution` · `Mammal` · `Mammalogy` · `Marine_biology` · `Mathematical_and_theoretical_biology` · `Matter` · `Mechanoreceptor` · `Median_preoptic_nucleus` · `Medulla_oblongata` · `Meiosis` · `Melanin` · `Mendelian_inheritance` · `Menstrual_cycle` · `Merriam-Webster` · `Metabolic_acidosis` · `Metabolic_alkalosis` · `Metabolic_pathway` · `Metabolism` · `Metastasis` · `Microbiology` · `Microbiome` · `Microevolution` · `Mitochondria` · `Mitosis` · `Molecular_biology` · `Molecule` · `Monomer` · `Motor_neuron` · `Muscles_of_respiration` · `Muscular_system` · `Mutation` · `Mycology` · `Natural_selection` · [[Negative_feedback]] · `Neo-Latin` · `Neontology` · `Neoplasm` · `Nephron` · [[Nervous_system]] · `Neuron` · `Neuropsychiatry` · [[Neuroscience]] · `Neurotransmitter` · `Normal_anion_gap_acidosis` · `Nuclear_receptor` · `Nucleic_acid` · `Nutrition` · `Nutritional_science` · `Oil_refinery` · `Organ_(biology)` · `Organelle` · `Organic_compound` · `Organism` · `Ornithology` · `Osmoreceptor` · `Osmoregulation` · `Osmosis` · `Osmotic_pressure` · `Osteology` · `Outline_of_biology` · [[Oxygen]] · `Oxygen_saturation_(medicine)` · `PCO2` · `PH` · `Paleontology` · `Pancreatic_islets` · `Parasitology` · `Parasympathetic_nervous_system` · `Parathyroid_gland` · `Parathyroid_hormone` · `Partial_pressure` · `Pathology` · `Peer_review` · `Peptide` · `Peripheral_nervous_system` · `Perspiration` · `Pharmacology` · `Pharming_(genetics)` · `Phloem` · `Phosphate` · `Phospholipid` · `Photobiology` · `Photosynthesis` · `Phycology` · `Phylogenetic_tree` · `Phylogenetics` · [[Physics]] · `Physiology` · `Phytoplankton` · `Plant` · `Plant_stem` · `Polymer` · `Pomology` · `Population_(biology)` · `Population_ecology` · `Post-transcriptional_modification` · [[Potassium]] · `Potassium_in_biology` · `Preoptic_area` · `Primatology` · `Prokaryote` · `Protein` · `Proteomics` · `Proteostasis` · `Protist` · `Protistology` · `Pyruvic_acid` · `Quantum_biology` · `Receptor_(biochemistry)` · `Red_blood_cell` · `Redox` · `Reductionism` · `Regulation_of_gene_expression` · `Renal_tubular_acidosis` · `Renin` · `Renin–angiotensin_system` · `Reproduction` · `Reproductive_biology` · `Reproductive_system` · `Resource_(biology)` · `Respiratory_acidosis` · `Respiratory_alkalosis` · `Respiratory_center` · `Respiratory_compensation` · `Respiratory_rate` · `Respiratory_system` · `Retrograde_signaling` · `Right-to-left_shunt` · `Root` · [[Science]] · `Scientific_law` · `Scientific_method` · `Scientific_theory` · [[Self-replication]] · `Senescence` · `Sensory_nerve` · `Setpoint_(control_system)` · `Shivering` · `Shoot_(botany)` · `Skeleton` · `Sociobiology` · [[Sodium]] · `Sodium-calcium_exchanger` · `Sodium_in_biology` · `Solitary_nucleus` · `Spatial_biology` · `Speciation` · `Spinal_cord` · `Steady_state_(biochemistry)` · `Steam_engine` · `Steroid` · `Steroid_hormone` · `Stimulus_(physiology)` · `Stress_(biology)` · `Stretch_receptor` · `Structural_biology` · [[Structure]] · `Superorganism` · `Sweat_gland` · `Sympathetic_nervous_system` · `Synapse` · `Syncope_(medicine)` · `Synthetic_biology` · `Systematics` · [[Systems_biology]] · `Tachycardia` · `Taxonomic_rank` · `Taxonomy_(biology)` · `Temperature` · `Teratology` · `The_Civic_Culture` · `The_Postmodern_Condition` · `Thermogenesis` · `Thermoreceptor` · `Thermoregulation` · `Thermostat` · `Thirst` · `Thoracic_diaphragm` · `Timeline_of_biology_and_organic_chemistry` · `Tissue_(biology)` · `Tonicity` · `Toxicology` · `Transcriptional_regulation` · `Transepidermal_water_loss` · `Tubuloglomerular_feedback` · `Vascular_plant` · `Vascular_tissue` · `Vasoconstriction` · `Vasodilation` · `Vasopressin` · `Vena_comitans` · `Very_low-density_lipoprotein` · `Virology` · `Virophysics` · `Virus` · `Vis_medicatrix_naturae` · `Vitamin_B12` · `Vomiting` · `Walter_Bradford_Cannon` · `Water` · `Welfare_biology` · `Xenobiology` · `Xylem` · `Zona_glomerulosa` · `Zoology`
## From the Real GENERATIVE library (beauty pass)
*Homeostasis — animation hotlinked from Wikimedia Commons (via the Real G.E.N.E.R.A.T.I.V.E. course library, Information room). [Details & license](https://commons.wikimedia.org/wiki/File:Negative_Feedback_Gif.gif).*
*Homeostasis — image hotlinked from Wikimedia Commons (via the Real G.E.N.E.R.A.T.I.V.E. course library, Information room). [Details & license](https://commons.wikimedia.org/wiki/File:DNA_simple.svg).*
> In biology, homeostasis (British also homoeostasis; /hɒmioʊˈsteɪsɪs, -miə-/) is the state of steady internal physical and chemical conditions maintained by living systems.[1] This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, being kept within certain pre-set limits (homeostatic range). Other variables include the pH of extracellular fluid, the concentrations of sodium, potassium, and calcium ions, as wel ([Wikipedia](https://en.wikipedia.org/wiki/Homeostasis))
<!-- BEAUTY-PASS-MEDIA:END -->
> p5.js MicroSim stub · part of Systems Thinking · [Wikipedia source](https://en.wikipedia.org/wiki/Homeostasis)
> Relation: subfield of systems thinking.
## Concept summary
In Biology, homeostasis (British also homoeostasis; /ˌhoʊmiəˈsteɪsɪs/ HOH-mee-ə-STAY-sis) is the state of steady internal physical and chemical conditions maintained by [[Living_systems|living systems]]. This is the condition of optimal functioning for the organism and includes many variables, such as body ...
## Build checklist
- [ ] Claim it: set `status: in-progress` + `lease` + `leased_at`
- [ ] Write the child page explaining the concept (tie it back to systems thinking)
- [ ] Finalize parameter ranges and defaults
- [ ] Implement the p5.js sketch (drawing + control regions)
- [ ] Add caption + the learning objective on the page
- [ ] Set `status: done`
## p5.js sketch
```javascript
// MicroSim: Homeostasis
let controls = {};
function setup() {
// createCanvas(...); create sliders for the parameters above.
}
function draw() {
// background(...); read controls; render control system; respond live.
}
```
---
Back to Systems Thinking · Wikipedia: [Homeostasis](https://en.wikipedia.org/wiki/Homeostasis)
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<!-- SEMIOTIC-PROFILE:START -->
## Semiotic profile
> *The semiotic universals this article invokes, machine-derived from the crossref — **unverified** (born so). Populated 2026-07-06 for the Systems room.*
**Universals (7):** 🟢 equilibrium (14) · 🟡 system (14) · 🟢 feedback (8) · 🟡 science (5) · 🟢 control loop (3) · 🟢 temperature heat (1) · 🟢 tradeoff balance (1)
**Enter by sign:** Systems Semiotic Gateway · Alphabetum · Icon Registry · ← Systems Portal
<!-- SEMIOTIC-PROFILE:END -->
<!-- BEAUTY-PASS-MEDIA:START -->
## Wikipedia : Wikitube
**Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Homeostasis) : [Wikitube](https://en.wikitube.io/wiki/Homeostasis)
## Previous hub tags
Tree parents: [[Complex_system]] · [[Control_theory]] · [[Cybernetics]] · [[Decision_theory]] · [[Emergence]] · [[Feedback]] · [[Information_theory]] · [[Self-organization]] · [[Systems_science]] · [[Systems_theory]].
Legacy hubs: none.
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*Sources: 2 legacy notes. Minted wave 1, 2026-07-30 (v1.6 order).*