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List of human endocrine organs and actions
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    List of human endocrine organs and actions

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    Hypothalamic-pituitary axis

    Endocrine glands in the human head and neck and their hormones

    Hypothalamus

    Secreted hormone Abbreviation Produced by Effect
    Thyrotropin-releasing hormone TRH Parvocellular neurosecretory neurons Stimulate thyroid-stimulating hormone (TSH) release from anterior pituitary (primarily)
    Dopamine
    (Prolactin-inhibiting hormone)
    DA or PIH Dopamine neurons of the arcuate nucleus Inhibit prolactin released from anterior pituitary
    Growth hormone-releasing hormone GHRH Neuroendocrine neurons of the Arcuate nucleus Stimulate Growth hormone (GH) release from anterior pituitary
    Somatostatin
    (growth hormone-inhibiting hormone)
    SS, GHIH, or SRIF Neuroendocrine cells of the Periventricular nucleus Inhibit Growth hormone release from anterior pituitary
    Inhibit thyroid-stimulating hormone (TSH) release from anterior pituitary
    Gonadotropin-releasing hormone GnRH or LHRH Neuroendocrine cells of the Preoptic area Stimulate follicle-stimulating hormone (FSH) release from anterior pituitary
    Stimulate luteinizing hormone (LH) release from anterior pituitary
    Corticotropin-releasing hormone CRH or CRF Parvocellular neurosecretory neurons of the Paraventricular nucleus Stimulate adrenocorticotropic hormone (ACTH) release from anterior pituitary
    Oxytocin OX or OXT Magnocellular neurosecretory cells In females: uterine contraction during birthing, lactation (letdown reflex) when nursing
    Vasopressin
    (antidiuretic hormone)
    ADH or AVP or VP Parvocellular neurosecretory neurons, Magnocellular neurosecretory neurons of the Paraventricular nucleus and Supraoptic nucleus Increases water permeability in the distal convoluted tubule and collecting duct of nephrons, thus promoting water reabsorption and increasing blood volume

    Pineal body (epiphysis)

    Secreted hormone From cells Effect
    Melatonin Pinealocytes Antioxidant
    Monitors the circadian rhythm including induction of drowsiness and lowering of the core body temperature

    Pituitary gland (hypophysis)

    The pituitary gland (or hypophysis) is an endocrine gland about the size of a pea and weighing 0.5 grams (0.018 oz) in humans. It is a protrusion off the bottom of the hypothalamus at the base of the brain, and rests in a small, bony cavity (sella turcica) covered by a dural fold (diaphragma sellae). The pituitary is functionally connected to the hypothalamus by the median eminence via a small tube called the infundibular stem or pituitary stalk. The anterior pituitary (adenohypophysis) is connected to the hypothalamus via the hypothalamo–hypophyseal portal vessels, which allows for quicker and more efficient communication between the hypothalamus and the pituitary.

    Anterior pituitary lobe (adenohypophysis)

    Secreted hormone Abbreviation From cells Effect
    Growth hormone
    (somatotropin)
    GH Somatotrophs Stimulates growth and cell reproduction
    Stimulates Insulin-like growth factor 1 release from liver
    Thyroid-stimulating hormone
    (thyrotropin)
    TSH Thyrotrophs Stimulates thyroxine (T4) and triiodothyronine (T3) synthesis and release from thyroid gland
    Stimulates iodine absorption by thyroid gland
    Adrenocorticotropic hormone
    (corticotropin)
    ACTH Corticotrophs Stimulates corticosteroid (glucocorticoid and mineralcorticoid) and androgen synthesis and release from adrenocortical cells
    Beta-endorphin Corticotrophs Inhibits perception of pain
    Follicle-stimulating hormone FSH Gonadotrophs In females: Stimulates maturation of ovarian follicles in ovary
    In males: Stimulates maturation of seminiferous tubules
    In males: Stimulates spermatogenesis
    In males: Stimulates production of androgen-binding protein from Sertoli cells of the testes
    Luteinizing hormone LH Gonadotrophs In females: Stimulates ovulation
    In females: Stimulates formation of corpus luteum
    In males: Stimulates testosterone synthesis from Leydig cells (interstitial cells)
    Prolactin PRL Lactotrophs Stimulates milk synthesis and release from mammary glands
    Mediates sexual gratification
    Melanocyte-stimulating hormone MSH Melanotropes in the Pars intermedia of the Anterior Pituitary Stimulates melanin synthesis and release from skin/hair melanocytes

    Posterior pituitary lobe (neurohypophysis)

    Stored hormone Abbreviation From cells Effect
    Oxytocin OX or OXT Magnocellular neurosecretory cells In females: uterine contraction during birthing, lactation (letdown reflex) when nursing
    Vasopressin
    (antidiuretic hormone)
    ADH or AVP Parvocellular neurosecretory neurons Increases water permeability in the distal convoluted tubule and collecting duct of nephrons, thus promoting water reabsorption and increasing blood volume

    Oxytocin and anti-diuretic hormone are not secreted in the posterior lobe, merely stored.

    Thyroid

    Secreted hormone Abbreviation From cells Effect
    Triiodothyronine T3 Thyroid epithelial cell (More potent form of thyroid hormone)
    Stimulates body oxygen and energy consumption, thereby increasing the basal metabolic rate
    Stimulates RNA polymerase I and II, thereby promoting protein synthesis
    Thyroxine
    (tetraiodothyronine)
    T4 Thyroid epithelial cells (Less active form of thyroid hormone)
    (Acts as a prohormone to triiodothyronine)
    Stimulates body oxygen and energy consumption, thereby increasing the basal metabolic rate
    Stimulates RNA polymerase I and II, thereby promoting protein synthesis
    Calcitonin Parafollicular cells Stimulates osteoblasts and thus bone construction
    Inhibits Ca2+ release from bone, thereby reducing blood Ca2+

    Digestive system

    Endocrine Alimentary system en.svg

    Stomach

    Secreted hormone Abbreviation From cells Effect
    Gastrin (Primarily) G cells Secretion of gastric acid by parietal cells
    Ghrelin P/D1 cells Stimulate appetite.
    Neuropeptide Y NPY Increased food intake and decreased physical activity. It can be associated with obesity.
    Somatostatin D cells Suppress release of gastrin, cholecystokinin (CCK), secretin, motilin, vasoactive intestinal peptide (VIP), gastric inhibitory polypeptide (GIP), enteroglucagon

    Lowers rate of gastric emptying

    Reduces smooth muscle contractions and blood flow within the intestine.

    Histamine ECL cells stimulate gastric acid secretion
    Endothelin X cells Smooth muscle contraction of stomach

    Duodenum (small intestine)

    Secreted hormone From cells Effect
    Secretin S cells Secretion of bicarbonate from liver, pancreas and duodenal Brunner's glands

    Enhances effects of cholecystokinin, stops production of gastric juice

    Cholecystokinin I cells Release of digestive enzymes from pancreas

    Release of bile from gallbladder, hunger suppressant

    Liver

    Secreted hormone Abbreviation From cells Effect
    Insulin-like growth factor (or somatomedin) (Primarily) IGF Hepatocytes insulin-like effects

    regulate cell growth and development

    Angiotensinogen and angiotensin Hepatocytes vasoconstriction

    release of aldosterone from adrenal cortex dipsogen.

    Thrombopoietin THPO Hepatocytes stimulates megakaryocytes to produce platelets
    Hepcidin Hepatocytes inhibits intestinal iron absorption and iron release by macrophages

    Pancreas

    The pancreas is a heterocrine gland as it functions both as an endocrine and as an exocrine gland.

    Secreted hormone From cells Effect
    Insulin (Primarily) β Islet cells Intake of glucose, glycogenesis and glycolysis in liver and muscle from blood.

    Intake of lipids and synthesis of triglycerides in adipocytes. Other anabolic effects

    Glucagon (Also Primarily) α Islet cells Glycogenolysis and gluconeogenesis in liver.

    Increases blood glucose level.

    Somatostatin δ Islet cells Inhibit release of insulin

    Inhibit release of glucagon Suppress the exocrine secretory action of pancreas.

    Pancreatic polypeptide PP cells Self regulate the pancreas secretion activities and effect the hepatic glycogen levels.

    Kidney

    Secreted hormone From cells Effect
    Renin (Primarily) Juxtaglomerular cells Activates the renin–angiotensin system by producing angiotensin I of angiotensinogen
    Erythropoietin (EPO) Extraglomerular mesangial cells Stimulate erythrocyte production
    Calcitriol (1,25-dihydroxyvitamin D3) Proximal tubule cells Active form of vitamin D3

    Increase absorption of calcium and phosphate from gastrointestinal tract and kidneys inhibit release of PTH

    Thrombopoietin stimulates megakaryocytes to produce platelets

    Adrenal glands

    Adrenal cortex

    Secreted hormone From cells Effect
    Glucocorticoids (chiefly cortisol) zona fasciculata and zona reticularis cells Stimulates gluconeogenesis
    Stimulates fat breakdown in adipose tissue
    Inhibits protein synthesis
    Inhibits glucose uptake in muscle and adipose tissue
    Inhibits immunological responses (immunosuppressive)
    Inhibits inflammatory responses (anti-inflammatory)
    Mineralocorticoids (chiefly aldosterone) Zona glomerulosa cells Stimulates active sodium reabsorption in kidneys
    Stimulates passive water reabsorption in kidneys, thus increasing blood volume and blood pressure
    Stimulates potassium and H+ secretion into nephron of kidney and subsequent excretion
    Androgens (including DHEA and testosterone) Zona fasciculata and Zona reticularis cells In males: Relatively small effect compared to androgens from testes
    In females: masculinizing effects

    Adrenal medulla

    Secreted hormone From cells Effect
    Adrenaline (epinephrine) (Primarily) Chromaffin cells Fight-or-flight response:
    Noradrenaline (norepinephrine) Chromaffin cells Fight-or-flight response:
    Dopamine Chromaffin cells Increase heart rate and blood pressure
    Enkephalin Chromaffin cells Regulate pain

    Reproductive

    Endocrine reproductive system en.svg

    Testes

    Secreted hormone From cells Effect
    Androgens (chiefly testosterone) Leydig cells Anabolic: growth of muscle mass and strength, increased bone density, growth and strength,

    Virilizing: maturation of sex organs, formation of scrotum, deepening of voice, growth of beard and axillary hair.

    Estradiol Sertoli cells Prevent apoptosis of germ cells
    Inhibin Sertoli cells Inhibit production of FSH

    Ovarian follicle and corpus luteum

    Secreted hormone From cells Effect
    Progesterone Granulosa cells, theca cells Support pregnancy:

    Other:

    Anti-inflammatory

    Androstenedione Theca cells Substrate for estrogen
    Estrogens (mainly estradiol) Granulosa cells Structural:

    Protein synthesis:

    • Increase hepatic production of binding proteins

    Coagulation:

    Fluid balance:

    Gastrointestinal tract:

    • Reduce bowel motility
    • Increase cholesterol in bile

    Melanin:

    Cancer:

    Lung function:

    • Promote lung function by supporting alveoli.
    Inhibin Granulosa cells Inhibit production of FSH from anterior pituitary

    Placenta (when pregnant)

    Secreted hormone Abbreviation From cells Effect
    Progesterone (Primarily) Support pregnancy:

    Other effects on mother similar to ovarian follicle-progesterone

    Estrogens (mainly Estriol) (Also Primarily) Effects on mother similar to ovarian follicle estrogen
    Human chorionic gonadotropin HCG Syncytiotrophoblast Promote maintenance of corpus luteum during beginning of pregnancy

    Inhibit immune response, towards the human embryo.

    Human placental lactogen HPL Syncytiotrophoblast Increase production of insulin and IGF-1

    Increase insulin resistance and carbohydrate intolerance

    Inhibin Fetal Trophoblasts Suppress FSH

    Uterus (when pregnant)

    Secreted hormone Abbreviation From cells Effect
    Prolactin PRL Decidual cells milk production in mammary glands
    Relaxin Decidual cells Unclear in humans and animals

    Calcium regulation

    Parathyroid

    Secreted hormone Abbreviation From cells Effect
    Parathyroid hormone PTH Parathyroid chief cell Calcium:
    • Stimulates Ca2+ release from bone, thereby increasing blood Ca2+
    • Stimulates osteoclasts, thus breaking down bone
    • Stimulates Ca2+ reabsorption in kidney
    • Stimulates activated vitamin D production in kidney


    Phosphate:

    • Stimulates PO3−4 release from bones, thereby increasing blood PO3−4.
    • Inhibits PO3−4 reabsorption in kidney, so more PO3−4 is excreted
    • Overall, small net drop in serum PO3−4.

    Skin

    Secreted hormone From cells Effect
    Cholecalciferol (vitamin D3) Keratinocytes Cholecalciferol is an inactive form of vitamin D3


    Cholecalciferol is converted in the liver first to 25-hydroxycholecalciferol (calcifediol) then to 1,25-dihydroxycholecalciferol (calcitriol), which is the hormonally active metabolite of vitamin D. Calcitriol increases the level of calcium (Ca2+
    ) in the blood by increasing the uptake of calcium from the gut into the blood, increasing reabsorption of calcium by the kidneys, and possibly increasing the release of calcium into the blood from bone.

    Other

    Endocrine miscelaneous en.svg

    Heart

    Secreted hormone Abbreviation From cells Effect
    Atrial natriuretic peptide ANP Cardiac myocytes Reduce blood pressure by:

    reducing systemic vascular resistance, reducing blood water, sodium and fats

    Brain natriuretic peptide BNP Cardiac myocytes (To a lesser degree than ANP) reduce blood pressure by:

    reducing systemic vascular resistance, reducing blood water, sodium and fats

    Bone

    Secreted hormone From cells Effect
    Osteocalcin osteoblasts stimulates beta cells to produce insulin

    Skeletal muscle

    In 1998, skeletal muscle was identified as an endocrine organ due to its now well-established role in the secretion of myokines. The use of the term myokine to describe cytokines and other peptides produced by muscle as signalling molecules was proposed in 2003.

    Adipose tissue

    Signalling molecules released by adipose tissue are referred to as adipokines.

    Secreted hormone From cells Effect
    Leptin (Primarily) Adipocytes decrease of appetite and increase of metabolism.
    Estrogens (mainly Estrone) Adipocytes

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