The Human Body Of The Thyroid Gland

Graves ' disease is an immune system disorder that results in the overproduction of thyroid hormones (hyperthyroidism). The thyroid gland is an important organ of the endocrine system. The gland is located at the front of the neck above where the collarbones meet. This gland releases the hormones thyroxine (T4) and triiodothyronine (T3), which control body metabolism. Controlling metabolism is important for regulating mood, weight, and mental and physical energy levels. When the body makes too much thyroid hormone, the condition is called hyperthyroidism. Graves disease is the most common cause of hyperthyroidism and is most common in women over age 20. But the disorder can occur at any age and can affect men as well. Some of the symptoms of Graves diseases are

Experts aren’t sure the exact cause of Graves’ disease because it is an autoimmune disease. There are certain risk factors associated with Graves’ disease which include genetics, gender, age, pregnancy, mental stress, and smoking. People who have family history of this disease are more likely to develop it. Also females are more likely than males to acquire Graves’ disease and onset of the disease usually occurs after the age of 20. Anatomy affected by this disease is the thyroid gland which is part of the endocrine system. It is located at the back of the neck, below the Adam’s apple. This disease doesn’t destroy the thyroid gland, instead an antibody called thyrotropin receptor antibody makes the thyroid produce large amounts of hormone. The thyroid produces two hormones, thyroxine and triiodothyronine. These hormones affect many body systems and play a key role in regulating the body’s metabolic rate. Excessive secretion of these hormones is what causes the signs and symptoms that have already been described.

Week 3 – LOM Assignment The thyroid is responsible for taking iodine and converting it into thyroid hormones which are released into the blood stream and transported throughout the body where they control metabolism.1 The thyroid is a vital part of the human body as every cell in the body depends on it for metabolic regulation. Too much or too little thyroid hormone secretion can result in hyperthyroidism or hypothyroidism. Hyperthyroidism is caused when the thyroid secretes too many thyroid hormones. Hyperthyroidism causes a rapid heart rate, elevated blood pressure and tremors. Other symptoms include increased nervousness, inability to concentrate, weakness, restlessness, difficulty sleeping, frequent bowel movements, weight loss and irregular

The thyroid is a butterfly-shaped gland. You would find it located in the lower neck, right below the Adam’s apple. The location is the same in both men and women. What the thyroid does is create and store thyroid hormone. It then releases the hormone in appropriate amounts to keep the body’s metabolism functioning at a normal level. If there is too much thyroid hormone, this is known as hyperthyroidism. In hyperthyroidism, the body’s metabolism increases. This condition can cause high blood pressure, high heart rate, nervousness, palpitations, and severe weight loss. Too little thyroid hormone, on the other hand, can cause tiredness, depression, memory loss, dry skin, brittle hair, and weight gain—among many other symptoms.

Karen Holt describes in her 2010 article Graves’ Disease: Clinical Pathophysiology, Presentation and Treatment Options of certain genetic markers that cause the blood vessels surrounding the thyroid gland to dilate, most often occurring in the second to third decade of life. The dilation of these vessels causes an increase in blood flow and thyroid-stimulating antibodies excite thyrotropin receptors on the gland itself in the same manner that TSH usually works. These antibodies, known as TSAb, bypass the negative feedback loop that TSH works under causing the follicles to produce thyroid hormones in copious amounts without the ability to turn themselves “off”. This in turn causes the thyroid gland to hypertrophy and grow as much as 2 to 3 times its normal size (p. 13-14). In an effort to stop the overproduction of thyroid hormones the pituitary gland will stop making TSH and this becomes part of the diagnosing for Graves’ disease when assessing hyperthyroidism. Increased levels of free T3 and T4 along with an almost non-detectable level of TSH in a blood screen are very indicative of Graves’ disease (Holt, 2010, p. 14). There is no cure for Graves’ disease, but it is treatable with lifestyle adjustments as well as drug therapy it can be managed to a point (p 46).

Commonly, problems with the thyroid involve an abnormal production level of these hormones. It is called hyperthyroidism if there the thyroid hormones are overproduced, and this can cause things like Graves’ disease, Toxic adenomas, and subacute thyroiditis (7). Hypothyroidism is the underproduction of the hormones which can be caused by an inflamed thyroid, iodine deficiency, a non-functioning thyroid gland and more. Hypothyroidism is especially dangerous in infants and newborns as the lack of these thyroid hormones can lead to mental retardation and dwarfism (7). However, in humans hypothyroidism can be caused by things such as a pituitary disorder, a defective thyroid or a lack of the gland completely. (7)

Normally, the thyroid gets its production orders through another chemical called thyroid-stimulating hormone (TSH), released by the pituitary gland in the brain. But in Graves' disease, a malfunction in the body's immune system releases abnormal antibodies that mimic TSH. Spurred by these false signals to produce, the thyroid's hormone factories work overtime and exceed their normal quota.

Graves’ disease is an autoimmune disease in which the over activity of the thyroid gland causes the overproduction of the thyroid hormone. This disease was described by Robert J. Graves a doctor from Ireland and is also known as Basedow’s disease. Even though there are several disorders that may result in hypothyroidism, grave disease is one of the most common type of hypothyroidism that occurs in 1 percent of U. S population (Anderson 2010). Furthermore, Grave disease is a disease that can affect anyone, but is more common amongst females before age 40. Concerning, grave disease will attack the immune system making antibodies that will cause the thyroid to enlarge and produce more than the amount of thyroid hormone that your body will need. These hormones that cause the thyroid to enlarge are called thyroid stimulating immunoglobulins. Thyroid stimulating immunoglobulins are antibodies that tells the thyroid gland to become more active and release excess amounts of thyroid hormone into the blood (U.S. National library of medicine).

Graves’ disease is an autoimmune disease that was discovered by Robert Graves in 1835. Graves’ disease is an autoimmune disease in which the body's immune system attacks the thyroid gland and causes hyperthyroidism. Graves’ disease occurs when the antibodies like thyroid-stimulating immunoglobulin and thyrotropin receptor antibodies (TRAbs) attack the thyroid gland as if it were a foreign object or a virus of some sort. This disease is the most common type of hyperthyroidism. Attacking

The thyroid gland is the gland that makes and stores hormones that help regulate the heart rate, blood pressure, body temperature, and metabolism. Thyroid hormones are essential for the function of every cell in the body. They help regulate growth and the rate of chemical reactions in the body. Thyroid hormones also help children grow and develop. The thyroid gland is located in the lower part of the neck, below the Adam's apple, wrapped around the trachea. It has the shape of a butterfly with two lobes attached to one another by a middle part called the isthmus. The thyroid uses iodine, a mineral found in some foods and in iodized salt, to make its hormones. The two most important thyroid hormones are thyroxine (T4) and triiodothyronine

Thyroid hormones are thermogenic which means that they tend to produce heat through metabolic stimulation. They interact with other hormones to modulate protein, carbohydrate and fat metabolism as well5. As mentioned earlier, one main symptom of Graves’ disease is heat intolerance which can cause excess sweating of the patient. Since thyroid hormones produce heat, if a patient has over stimulation of the hormone, that is what causes the excess heat production. In Graves’ disease, the body produces antibodies called thyroid-stimulating immunoglobulins (TSI). They take the place of TSH attaching to the TSH receptors and activating them on the thyroid gland. Therefore, the negative feedback loop of over secretion of the thyroid gland is blocked and cannot be

Hypothyroidism is a condition where the thyroid does not produce enough of the hormones that are required to maintain metabolism (Harvard School of Medicine, 2007).

Graves’ disease, also known as hyperthyroidism is an autoimmune disorder that occurs when antibodies overstimulate thyroid stimulating hormone (TSH). Hyperstimulation of TSH receptors leads to an increased amount of circulating triiodothyronine (T3) and thyroxine (T4). An increased production of T3 and T4 lead to an increased metabolic rate. This can lead to clinical manifestations of diaphoresis, heat intolerance, increased cardiac output, tachycardia, exophthalmos and weight loss. If untreated, hyperthyroidism can turn into a thyrotoxic crisis, triggered by stressful events. Thyrotoxic crisis exceeds the metabolic strains on the body. Clinical manifestations such as hyperthermia, tachycardia, and heart failure can lead to death within forty-eight

Thyroid Function Tests: The thyroid’s job is to make thyroid hormones, which are secreted into the blood and the carried to every tissue in the body. The major thyroid hormone secreted by the thyroid gland is thyroxine, also called T4 as it contains four iodine atoms. T4 is converted to T3 (triodothyronine) by removal of iodine atom. It occurs mainly in liver and in brain. The amount of T4 produced is controlled by another hormone which is made in the pituitary gland located at the base of brain, called thyroid stimulating hormone (TSH). The amount of TSH is in the blood depends on the amount of T4 that the pituitary sees. If the pituitary sees very little T4, then it produces more TSH to tell thyroid gland to produce more T4.When T4 in the bloodstream goes above a certain level, the pituitary’s production of TSH is shut off. The thyroid and pituitary act like heater and a thermostat. If it’s cold the thermostat reads the temperature and turns on the heater. Thus, the thyroid and pituitary, like heater turn on and off. T4 and T3 circulate almost entirely proteins, and when these proteins change their level in the blood, there is change in T4 and T3 levels.

The main cause of hyperthyroidism Graves’ disease which affects quite a few people in the general population. This disease is characterized as an autoimmune disorder. This means that the body makes antibodies known as thyroid stimulating immunoglobulin that bind and over activate the production of thyroid hormones [3]. So in essence the antibody mimics the thyroid stimulating hormone and when the negative feedback loop is in affect the antibody still binds to the thyroid and T3 and T4 are over produced [2].