 |
Growth hormone also called Hgh 30000 is secreted by the anterior pituitary gland. It is a major product of gland, which contains 5 mg of the hormone (about 10% of its dry weight). As its name implies, growth hormone is important in controlling linear growth and, together with thyroid hormones and sex hormones, is important in determining the final height and development an individual. It also has a role in controlling the metabolism of food, so the absence of the hormone in children leads to a small size with the whole body in proportion, while deficiency in adults results in weakness and depression.
Growth stops when the epiphyses (ends) to fuse the bones of the main shaft between them. Over secretion before this happens result in gigantism, whereas most of the secretion from the results in acromegaly, a disease characterized by enlargement facial features and enlargement of hands and feet. Interest in dwarfism, gigantism, acromegaly and has survived the centuries, literature, especially for children, is filled with stories about dwarfs and giants, while the Old Testament writings were several descriptions of giants. A study of painting can also be subjects with impaired secretion of growth hormone. A portrait of about 1365 BC Tutankhamun's father-in-law illustrates some of chacterisitics of acromegaly, but it took until the late eighteenth century Saucerette, a French surgeon, described with a story suggesting the condition. During the nineteenth century, a number of articles have appeared, and the term "acromegaly" was invented in 1886 by Pierre-Marie. The following year, Minkowski (who also directed some of the first important experiments in the discovery of insulin) noted that acromegaly was associated with a pituitary tumor. These tumors are now known to be the cause of gigantism and acromegaly. Once this is established, surgical treatment of the condition has begun to be attempted in the 1890s. In 1912, Cushing, an American neurosurgeon famous who also made major contributions to endocrinology inaugurated the practice of operating on tumors of the pituitary nasally.
The approach of the nose to the pituitary is possible because the gland itself is located on the midline at the base of the brain. Some the visual pathway, the "optic chiasma" is in front of the pituitary tumor spread so may lead to visual defects. This could explain Goliath why not see the stone thrown by David.
Growth hormone is a large peptide of 191 amino acids and is relatively specific in the case, so that growth hormone primates is effective in humans. This meant that until 1985, when he became possible to synthesize the treatment of small occupied growth hormone extracted from human pituitary glands. As with some preparations Human gonadotropins previously used in fertility treatments, some preparations have been contaminated, leading to 1 in 1000 Patients who develop Creutzfeldt Jacob disease, resulting in dementia and death. Currently, the biosynthetic growth hormone is used.
Growth hormone is still detectable in the plasma of healthy individuals throughout life, it is not secreted continuously during the 24 hours, but in bursts. The largest increase following the onset of sleep, then there may be a basic tale of the old woman you will not grow if you do not get a good night sleep. The hormone is present in the fetus, but does not appear to be necessary for growth until shortly after birth. Its output is increased in puberty at an early stage in girls than in boys. The secretion of growth hormone is controlled by the hypothalamus, a brain region that is important in regulating many functions including a major role in the response to Stress: Growth hormone is secreted in response to a number of constraints such as exercise, anesthesia and surgery. Prolonged stress may however suppress the release of growth hormones, so that children with emotional deprivation may show a marked stunted secondary. Such a case is said Sir James Barrie, who was short of stature and may have had a certain affinity with his creation, Peter Pan.
Release is stimulated in response to a rapid drop in blood sugar, which can be produced by an injection of insulin in a clinical trial for the secretion growth hormone. The hypothalamus controls the secretion of growth hormone through its own secretion of two peptides, somatostatin, that inhibits secretion and hormone-releasing hormone growth, which is exciting, these hormones reach the anterior pituitary relatives through local blood vessels.
Growth hormone stimulates the growth of long bones, not directly but through the action of somatomedins, who are insulin-like growth factors produced in the liver, and also inhibit the release of the hormone. It has a direct effect on metabolic processes in the body to support growth through increased formation of proteins and nucleic acids (anabolic) and other constituents of the mass lean body. However its effects promote the degradation of carbohydrates and lipids, with the energy released to support growth. Because of the anabolic effects and because detection is difficult, growth hormone has been used by athletes to improve performance, although studies have showed that it is of little value.
What are anabolic steroids?
