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A Critical And In Depth Analysis Of Pituitary Dwarfism!

2812 words - 11 pages

The first eighteen years of a person's life are very important in terms of growth. It is during these years that an individual slowly develops from a small, delicate baby, into a strong, mature adult. Growing up in this fashion is not always the case for some children, as many do not reach their full growth potential. In many cases, this is hereditary, and cannot be avoided, but sometimes, short stature is a disease that can be treated, and to a point cured. This disease is called pituitary dwarfism or more commonly known as growth hormone deficiency. To fully understand pituitary dwarfism, it's symptoms, causes, and treatments, one must first understand the significance of the pituitary gland, the function of hormones and the role of growth hormone in the human growth process.The pituitary is a small bean-shaped, reddish-gray organ located in the saddle-shaped depression (sella turcica) in the floor of the skull (the sphenoid bone) and attached to the base of the brain by a stalk . The gland is comprised of two segments, the anterior (front) and posterior (back) lobes. The posterior lobe makes up 25% while the anterior lobe accounts for the remaining 75% of the gland. Even though both lobes together are only about the size of a small acorn, they represent a major player in the endocrine system. Because it releases the major hormones involved in growth, we will be concerned only with the anterior section of the gland. The major function of the anterior pituitary is tropic. This suffix is used to point out hormones that affect other glands and organs. The anterior pituitary produces six vital tropic hormones:Thyroid-stimulating hormone (TSH)Adrenocorticotropic hormone (ACTH)Follicle-stimulating hormone (FSH)Luteinizing hormone (LH)Lactotropic Hormone (LTH)Growth Hormone (GH)The most important of these hormones in terms of growth, is Growth Hormone (GH). Before delving into the world of GH, some background is needed on the role of a hormone.Hormones are substances released into the bloodstream from a gland like the pituitary, or an organ that affect activity in cells at another site . Hormones are proteins made up of folded amino acid chains, typically between 50 and 100 amino acids long . The folds in the chains cause the hormone to take on a tiny three-dimensional shape specific to that particular hormone. Because of this specific shape, a hormone can attach to receptor proteins that are present on the membrane surface of target cells (see fig 1). The shape of the protein molecule on the cell will exactly match that of the hormone binding with it . Cells are equipped with this mechanism so as to prevent hormones from binding with any cell it comes in contact with. For a hormone to function properly, it must bind with the correct cells. The shape of the proteins on a hormone is incredibly important as they serve as a means of identifying its hormone's target cell (see fig 2). When a protein hormone attaches to its receptor, the receptor acts by...

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