Endocrine System内分泌系统

Place · Level 3

激素 = 化学邮件 · 下丘脑总编辑部 · 5 个轴心 (甲状腺/肾上腺/胰岛/性腺/生长) · 营养是燃料和原料

Hypothalamus + pituitary master

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下丘脑 + 垂体 · 总编辑部

Hormones can be understood as chemical mail in the body: produced by endocrine glands, released into the blood, and binding receptors on the surface or in the nucleus of distant target cells to trigger a response.

The master editor of this whole system is the hypothalamus + pituitary at the base of the brain:

The hypothalamus receives signals from across the body (glucose, temperature, stress, circadian rhythm, reproductive signals), then writes 'releasing hormones' (TRH, CRH, GnRH, GHRH, somatostatin, etc.)The anterior pituitary receives these releasing hormones and secretes 'distal hormones' (, ACTH, LH-FSH, GH, prolactin)The posterior pituitary directly stores ADH (antidiuretic hormone) and oxytocin produced by the hypothalamus
This architecture is called an 'axis', with signals propagating along a vertical path:

HPT axis: hypothalamus → pituitary → thyroid axis: hypothalamus → pituitary → adrenalsHPG axis: hypothalamus → pituitary → gonadsHP-growth axis: hypothalamus → pituitary → whole body tissues (via GH + IGF-1)
Each axis has negative feedback — the distal hormone loops back to inhibit hypothalamus and pituitary, forming a homeostatic loop. This is why supplementing the hormone of any single axis (anabolic steroids, exogenous thyroid hormone, glucocorticoids) causes the corresponding gland to atrophy: feedback shuts off endogenous production.

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