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Human resources for health
Human resources for health (HRH), also called the health workforce, is the stock of people engaged in protecting and improving health, a core building block of health systems.
Human skeleton
Human skeleton: the body's bony framework, 206 named adult bones in axial (80) and appendicular (126) divisions, about 270 at birth, with support, protection, movement, blood cell production, and mineral storage functions.
Human skin
Human skin, the body's largest organ (about 6 pounds, 18 square feet), has three layers: epidermis, dermis, and hypodermis; it provides barrier, sensory, thermoregulatory, and vitamin D functions and hosts a diverse microbiome.
Human skin color
Human skin color is melanin-based pigmentation shaped by UV radiation via the vitamin D–folate hypothesis: dark equatorial skin conserves folate, depigmented high-latitude skin aids vitamin D synthesis, evolving polygenically across SLC24A5, SLC45A2, MC1R, and KITLG.
Human subject research
Human subject research: systematic investigation involving living people contributing data or samples. Governed by the 1991 U.S. Common Rule (45 CFR 46), the 1979 Belmont Report, informed consent, and IRB review; FDA regulates clinical investigations separately.
Human vaginal size
Human vaginal size: measurable length and width of the vaginal canal, also called vaginal dimensions. MRI baselines: 62.7 mm undistended length, widths 26–33 mm, large inter-individual variation; size does not affect sexual function.
Human waste
Human waste (human excreta) is feces and urine from human metabolism. Distinguished by pathogen load, nutrient content (4.5 kg N per person yearly), and sanitation systems: safely managed coverage reached 58% by 2024.
Humerus
Humerus: the single long bone of the upper arm, largest bone of the upper limb, articulating with the scapula at the shoulder and radius and ulna at the elbow; fracture-prone at the surgical neck, radial groove, and supracondylar region.
Humoral immunity
Humoral immunity: the antibody-mediated arm of adaptive immunity, driven by B cells and plasma cells, protecting extracellular spaces; includes germinal center affinity maturation, five immunoglobulin classes, active versus passive immunity, and its 19th-century origins with Behring and Ehrlich.
Humorism
Humorism (humoralism, four humors): ancient Greek-Roman medical system of blood, phlegm, yellow bile, black bile; health as balance, disease as imbalance; Hippocrates, Galen, Avicenna; dominant until 19th-century germ theory; survives in Unani medicine.
Humulus scandens (Japanese hop) pollen allergen skin prick test solution
葎草花粉变应原皮肤点刺液, Skin Prick Solution for Humulus japonicus (Japanese hop) pollen allergens: Wolwo Biotech's NMPA-approved (国药准字 S20230025, 2023) 3333 DU/ml skin prick reagent aiding diagnosis of Humulus pollen type I allergy in China.
Hunger in the United States
Hunger in the United States is tracked officially as food insecurity, not hunger: USDA's CPS survey found 13.7% of households food insecure in 2024; SNAP (renamed from food stamps in 2008) is the main response, and the annual survey was discontinued in 2025.
Hunger Plan
The Hunger Plan, also known as der Backe-Plan, was a Nazi plan of 1941 to seize Soviet food for Germany, deliberately starving millions of Soviet citizens.
Hunter-McAlpine syndrome
Hunter-McAlpine syndrome (Hunter-McAlpine craniosynostosis, OMIM 601379) is an ultra-rare autosomal dominant disorder from 5q35-qter duplication, with craniosynostosis, intellectual disability, short stature, almond-shaped eyes, and about 10 reported patients.
Huntington disease-like 1
Huntington disease-like 1 (HDL1), also called Huntington-like neurodegenerative disorder 1, is a rare autosomal dominant familial prion disease from PRNP octapeptide repeat insertions, mimicking Huntington disease with chorea, dementia, seizures, onset 20-45 years, survival 1-10 years.
Huntington disease-like 2
Huntington disease-like 2 (HDL2) is a rare neurodegenerative disorder mimicking Huntington disease, caused by a JPH3 gene repeat expansion and seen only in people of African ancestry.
Huntington's disease
Huntington's disease (HD), also called Huntington's chorea, is an autosomal dominant neurodegenerative disease caused by CAG repeat expansion in the HTT gene, causing chorea, cognitive decline, and behavioral symptoms, typically starting in middle age with no cure.
Huoluan Lun
霍乱论 (Huoluan Lun), also Suixiju Chongding Huoluan Lun, is Wang Shixiong's 1838 Chinese monograph on cholera, the first of its kind, distinguishing cold and hot huoluan with formulas like Ranzhao Tang and Lianpo Yin, revised in 1862.
Huopo Xialing Decoction
藿朴夏苓汤 (Huopo Xialing Decoction), a classical Chinese medicine formula for damp-warmth from the Qing text Yi Yuan (1861), named by He Lianchen; ten herbs including patchouli, magnolia bark, pinellia, and poria; listed in the first Ancient Classic Formulas Directory.
Huriez syndrome
Huriez syndrome (sclerotylosis, OMIM 181600) is a rare autosomal dominant genodermatosis with congenital scleroatrophy, palmoplantar keratoderma, hypoplastic nails, and high risk of aggressive cutaneous squamous cell carcinoma, caused by SMARCAD1 haploinsufficiency.
Hurler syndrome
Hurler syndrome, also called Hurler's disease, is the most severe form of mucopolysaccharidosis type I, an inherited disorder causing developmental decline and death in childhood if untreated.
Husband stitch
The husband stitch, also known as the daddy stitch, is an extra stitch placed during childbirth repair to tighten the vagina, with no medical benefit.
HuT 78
HuT 78 (CVCL_0337, ATCC TIB-161) is a human Sézary syndrome T-cell lymphoma line from the NCI; its H9 subclone enabled HIV-1 propagation and blood-supply screening.
Hutabhugadi curna
Hutabhugadi churna (हुतभुगादि चूर्ण), a classical Ayurvedic polyherbal powder from Sahasrayoga with Plumbago zeylanica, Terminalia chebula, and rock salt, used for digestive impairment, anemia, edema, and piles.
Huzhen Qingfeng capsules
Huzhen Qingfeng capsules (虎贞清风胶囊, formerly Huzhen Tongfeng capsules) are a Class 1.1 innovative traditional Chinese medicine approved by China in 2021 for mild-to-moderate acute gouty arthritis.
Hyaline cartilage
Hyaline cartilage, also called articular or glassy cartilage, is the most common cartilage type: a type II collagen and aggrecan matrix lining joints, airways, ribs, and the fetal bone model.
Hyaline fibromatosis syndrome
Hyaline fibromatosis syndrome (HFS, inherited systemic hyalinosis, Murray syndrome) is a rare autosomal recessive ANTXR2 disorder causing hyaline tissue deposits, skin nodules, gingival hypertrophy, painful joint contractures, and protein-losing enteropathy.
Hyalocyte
Hyalocytes (of Hannover, Balazs) are yolk sac-derived resident macrophages of the eye's vitreous body, first identified in 1840, that maintain vitreous transparency, remodel the hyaloid vasculature, and drive proliferative vitreoretinal disease.
Hyaluronic acid injection
A hyaluronic acid injection delivers hyaluronan gel into tissue, either into the knee joint to relieve osteoarthritis pain or into facial soft tissue to fill lines and restore volume.
Hyaluronidase (drug)
Hyaluronidase (rHuPH20, HYLENEX recombinant) is an injectable enzyme degrading hyaluronic acid, FDA-approved for hypodermoclysis, drug dispersion, and urography, and used off-label to dissolve HA fillers and as an anesthesia adjunct.