Can hormones act within the glands in which they are synthesized?
155592
No, a characteristic of hormones is that they are secreted by endocrine glands in the extracellular space; from there they go to the blood. Blood transfers them to their target cells/organs which is where they act. For example, insuline secreted by the islets of Langerhans, the endocrine part of the pancreas, is one of the hormone that controls glucose level in the blood.\nOn the other hand, substances secreted by exocrine glands such as salivary glands and mucous glands, act in the place they are synthesized. Saliva gives moisture to the food and starts digesting starch in food.
942315
Too many hormones.Until now, there are about 50 plus hormones discovered in human body(that is what my lecture told me-she's a Dr. actually).\nHormones can be divided into 2 broad classes: lipid-soluble hormones and water-soluble hormones.\n\n1.Lipid-soluble hormones\nLipid-soluble hormones include steroid hormones,thyroid hormones and nitric hormones.\nSteroid hormones are derieved from cholesterol.\nThyroid hormones (triiodothyronine or T3 and thyroxine or T4) are synthezed by the thyroid hormones\nNitric Oxide(NO) is both a hormone and a neurotransmitter.\n\n2.Water-soluble hormones\nThis include the amine hormones,peptide and protein hormones and eicosanoid hormones.\n\nA)Amine hormones retained an amino group on them.Examples are the epinephrine and norepinephrine.\nB)Peptide and protein hormones are amino acid polymers.Examples are the antidiuretic hormone and oxytocin.\nC)Eicosanoid hormones are derived from arachidonic acid.Examples are the prostaglandins and leukotrienes.\n\nThat's the most simple answer that i can gave to you.Actually, it 's much more complicated than this.Hope this helps ya!
288642
Hormones are chemical messengers in the body that can do many things. It depends on the hormone. \n\nHormones trigger growth spurts and the onset of puberty. They can regulate blood sugar (insulin is a hormone). Hormones can trigger the 'fight or flight' response in you when you face danger (that's adrenalin). \n\nLook at these websites:\nhttp://en.wikipedia.org/wiki/Endocrine_system\nhttp://en.wikipedia.org/wiki/Hormones
279020
yes in some situations.  Sometimes a pituitary tumor can hypersecrete a hormone or sometimes a medication can inhibit an inhibitory hormone (that prevents a man from producing prolactin, hormone responsible for milk production) :) this is called GYNECOMASTIA.. men starts to produce milk but I've never heard giving them to babies.  maybe to their wives hahaha
815481
Try the word "gland" for hormone organ, and then generalised fits.
116232
Your endochrine glands. It is your thyroid and adrenal glands that release pheromones and control their production.
120410
I think they are called merocrine glands that release hormones and are located in your armpits and genital areas.\n\nThe other types of glands are called exocrine and endocrine...(sp)
424836
Depends on the hormone.  Different glands produce different hormones.  Some are produced by the hypothalamus in the brain, the thyroid, the adrenal glands on the kidneys, the liver, & the testis & ovaries.
99271
genetics and hormones
70386
After birth, the mother's estrogen and progesterone levels decrease thus causing the anterior pituatary to produce prolactin.  Prolactin gets the breast ready to secrete milk.  During lactation prolactin also synthesizes the milk.  Prolactin production is stimulated by the infant suckling.  \nOxytocin is also a hormone that plays a role in lactation.  Just as prolactin is stimulated by infant suckling, so is oxytocin.  As the infant suckles, the posterior pituary is triggered to produce oxytocin.  Oxytocin is responsible for the milk ejection reflex.  This reflex is accomplished by oxytocin stimulating the myoepithelial cell around the nipple and allowing the milk to be expressed through the ducts and out the nipple.
921263
I'm not positive, but I suspect it is similar to how most animals synthesize fluids: They have special glands that create the ink from fluids within their system that is collected from food they eat. It is likely a similar process to how a kidney filters toxins from the blood to make urine or how a snake makes venom by synthesizing proteins from nutrients from their food. Our bodies create bile, saliva, and a host of other fluids in the same way - they are generated by glands extracting the necessary components from our blood.
165172
Within cells or as a dietary 'supplement'?
989409
Hi, there isn't such a thing as the exocrine gland.  Any gland in the human body is classified as either endocrine or exocrine.  An endocrine gland secretes whatever it produces into the blood stream or straight into a bodily fluid, such as the pituitary gland or the adrenal glands on your kidneys, endocrine glands prodominately produce hormones, whereas an exocrine gland secretes it's produce from itself into a duct, such as the sweat glands or the mammary glands.
131630
The endocrine system is a control system of ductless glands that secrete chemical messengers called hormones that circulate within the body via the bloodstream to affect distant organs. Hormones act as "messengers", and are carried by the bloodstream to different cells in the body, which interpret these messages and act on them. The endocrine system does not include exocrine glands such as salivary glands, sweat glands and glands within the gastrointestinal tract.\n\nThe field of medicine that deals with disorders of endocrine glands is endocrinology, a branch of the wider field of internal medicine.\n\nHypothalamus \nThyrotropin-releasing hormone (TRH) \nGonadotropin-releasing hormone (GnRH) \nGrowth hormone-releasing hormone (GHRH) \nCorticotropin-releasing hormone (CRH) \nSomatostatin \nDopamine \nPituitary gland \nAnterior lobe (adenohypophysis) \nGH (human growth hormone) \nPRL (prolactin) \nACTH (adrenocorticotropic hormone) \nTSH (thyroid-stimulating hormone) \nFSH (follicle-stimulating hormone) \nLH (luteinizing hormone) \nPosterior lobe (neurohypophysis) \nOxytocin \nADH (antidiuretic hormone) \nPineal gland \nMelatonin \nThyroid gland \nThyroxine (T4), a form of thyroid hormone \nTriiodothyronine (T3), a form of thyroid hormone \nCalcitonin \nParathyroid gland \nParathyroid hormone (PTH) \nHeart \nAtrial-natriuretic peptide (ANP) \nStomach and intestines \nGastrin \nSecretin \nCholecystokinin (CCK) \nSomatostatin \nNeuropeptide Y \nLiver \nInsulin-like growth factor \nAngiotensinogen \nThrombopoietin \nIslets of Langerhans in the pancreas \nInsulin \nGlucagon \nSomatostatin \nAdrenal glands \nAdrenal cortex \nGlucocorticoids - cortisol \nMineralocorticoids - aldosterone \nAndrogens (including testosterone) \nAdrenal medulla \nAdrenaline (epinephrine) \nNoradrenaline (norepinephrine) \nKidney \nRenin \nErythropoietin (EPO) \nCalcitriol \nSkin \nCalciferol (vitamin D3) \nAdipose tissue \nLeptin \n\nIn males only\nTestes \nAndrogens (testosterone) \n\nIn females only\nOvarian follicle \nOestrogens \nTestosterone \nCorpus luteum \nProgesterone \nPlacenta (when pregnant) \nProgesterone \nHuman chorionic gonadotrophin (HCG) \nHuman placental lactogen (HPL) \n\nRole in disease\nDiseases of the endocrine system are common, such as diabetes mellitus and thyroid disease.\n\nEndocrineopathies can occur with any of these. Hypofunction can occur as result of loss of reserve, hyposecretion, agenesis, atrophy, destruction, etc. Hyperfunction can occur as result of hypersecretion, loss of suppression, tumor, hyperplasia, etc.\n\nEndocrineopathies are classified as primary, secondary, or tertiary.\n\nPrimary is target organ dysfunction and is normally associated with increased or decreased secretory hormones. Secondary is a dysfunction that originates elsewhere like the pituitary gland and is normally associated with increased or decreased production of trophic factors. Tertiary is associated with dysfunction of the hypothalamus and its releasing hormones.\n\nDiffuse Endocrine System\nOrgans aren't the sole way for hormones to be sent into the body; there are a host of specific cells which secrete hormones independently. These are called the "diffuse" endocrine system, and include myocytes in the heart (atria) and epithelial cells in the stomach and small intestines. In fact, if one were to classify any chemical excretions in the term "hormone," every cell in the human body could be considered a part of the endocrine system.
1026859
Google "DHEA". It's a steroid produced by your adrenal glands that acts as a precursor for testosterone & estrogen.
937434
The endocrine system is the collection of organs and tissues that make hormones.  The hormones themselves control many things throughout your body, from development to emotional states to simple digestion.  As chemicals which circulate though your blood, they are considered to be 'fast' signals, though not as fast as nerve signals and the like.  Hormones are also never stored in your body... just made quickly as they're needed and used quickly.
530221
B.\n\nA peptide hormone that is produced by fat cells. It plays a role in body weight regulation by acting on the hypothalamus to suppress appetite and burn fat stored in adipose tissue.