ductless
Lacking internal passages
Ductless describes glands or organs that secrete substances directly into the bloodstream rather than through a tube or duct.
The thyroid, pituitary, and adrenal glands are ductless, releasing hormones that travel throughout the body.
Outside anatomy, ductless describes systems that operate without ducts: a ductless air conditioning unit.
Internally secreting gland system
- pituitaryBrain-base hormone gland
- thyroidHormone-producing neck gland
- adrenalNear the kidneys
- pinealShaped like cones
parathyroid · thymus · pancreas · gonads · ovaries · testes · hypothalamus · islets of Langerhans
Pancreatic glucose-regulating hormone
- estrogenFemale reproductive hormone
- testosteroneChief male sex hormone
- adrenalineEmergency response hormone
- cortisolAdrenal steroid regulating stress
melatonin · serotonin · prolactin · oxytocin · leptin · ghrelin · glucagon · androgens
Metabolic disorder affecting glucose
- hyperthyroidismOverproduction of metabolic hormones
- hypothyroidismInsufficient thyroid hormone production
- acromegalyHormone-driven adult enlargement
- gigantismPathological excessive stature
dwarfism · goiter · hyperparathyroidism · hormonal imbalance · metabolic disorder
Wall-mounted HVAC unit
- air conditioningIndoor cooling system
- heatingRaising temperature artificially
- ventilationCirculation of fresh air
- split systemTwo-unit air conditioner
wall-mounted · zoned · compressor · refrigerant · outdoor unit · climate control · energy efficient · inverter
endocrine
Internally secreting gland system
pineal · parathyroid · thymus · pancreas · gonads · ovaries · testes · hypothalamus · islets of Langerhans · sebaceous
insulin
Pancreatic glucose-regulating hormone
- estrogenFemale reproductive hormone
- testosteroneChief male sex hormone
- adrenalineEmergency response hormone
cortisol · melatonin · serotonin · prolactin · oxytocin · leptin · ghrelin · glucagon · androgens · thyroxine
diabetes
Metabolic disorder affecting glucose
- hyperthyroidismOverproduction of metabolic hormones
- hypothyroidismInsufficient thyroid hormone production
- acromegalyHormone-driven adult enlargement
gigantism · dwarfism · goiter · hyperparathyroidism · hormonal imbalance · metabolic disorder
mini-split
Wall-mounted HVAC unit
- air conditioningIndoor cooling system
- heatingRaising temperature artificially
- ventilationCirculation of fresh air
split system · wall-mounted · zoned · compressor · refrigerant · outdoor unit · climate control · energy efficient · inverter · cooling
- heatingfurnace, boiler, baseboard heaters, radiator, heat pump
- Air ConditionersAC unit, central air, window unit, mini split, mini-split
- HVACair conditioner, furnaces, furnace, ductwork, central air
- Mini-Splitsmini split, split system, outdoor unit, wall unit, wall mount