Human growth hormone (somatotropin) is essential in the growth and the adult has an important role in metabolic activities. It is synthesized in acidophilic cells of the anterior pituitary and its secretion granules is regulated by intracellular deposit hypothalamic hormones GHRH (growth hormone-releasing hormone) and SRIF (somatotropin release-inhibiting factor); depends synthesis of neurotransmitters like serotonin, dopamine, norepinephrine and peptide growth hormone release.
It is also secreted in response to stress, stress, deep sleep, hypoglycemia, glucagon, insulin, thyroid hormones, estrogen, testosterone and vasopressin. In plasma exists in several isoforms monomeric and oligomeric. Circulating GH-binding protein bound, which is similar domain extramembranar tissue hGH receptor. hGH stimulates the production of RNA, protein synthesis, mobilizes fatty acids from storage and transient effects of insulin antagonistic; high levels for a long time can induce altered glucose tolerance. hGH secretion is pulsatile, but in adults plasma are stable oscillations are attenuated hGH GHBP. The half-life is 20 minutes Health Fitness Exercise
If the pituitary gland secretes hGH deficient or excessive in different stages of growth will cause dwarfism and gigantism, respectively. An excess of growth hormone in adults will generate acromegaly. Useful test for hypo-or hiperpituitarismului confirmation so that it can be initiated as soon as adequate therapy hormone determination can be made both in basal conditions and after stimulation (exercise , arginine, insulin or glucagon) or suppression (after the administration of 100 g glucose) Grow Taller 4 Idiots Review
After stimulation of hGH should increase> 5 ng / mL compared to the basal level> 10 ng / ml the maximum response as compared to basal level. After suppressed hGH normally undetectable or <2 ng / mL. Failure or inadequate response to stimulation tests associated with hypopituitarism. In case of gigantism or acromegaly, suppression or lack of records is incomplete suppression after administration of glucose. Furthermore, patients with acromegaly may increase paradoxical hGH suppression test Fitness Muscles
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