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The TSH, in turn, stimulates the thyroid to produce thyroid hormone until levels in the blood return to normal. Thyroid hormone exerts negative feedback control over the hypothalamus as well as anterior pituitary, thus controlling the release of both TRH from hypothalamus and TSH from anterior pituitary gland. [2]
Reverse T 3 is the third-most common iodothyronine the thyroid gland releases into the bloodstream, at 0.9%; tetraiodothyronine (levothyroxine, T 4) constitutes 90% and T 3 is 9%. However, 95% of rT 3 in human blood is made elsewhere in the body, as enzymes remove a particular iodine atom from T 4. [1]
Hyperthyroidism is the condition that occurs due to excessive production of thyroid hormones by the thyroid gland. [3] Thyrotoxicosis is the condition that occurs due to excessive thyroid hormone of any cause and therefore includes hyperthyroidism. [3]
A number of medical conditions can cause an obstruction in the normal flow of cerebrospinal fluid, redirecting it into the spinal cord itself. For reasons that are only now becoming clear, this results in syrinx formation. Cerebrospinal fluid fills the syrinx. Pressure differences along the spine cause the fluid to move within the cyst.
Meaning T: Thoracic Vertebrae. Testosterone. T x: Treatment: T3 Triiodothyronine: T4 Thyroxine: TA: temporal arteritis T&A: tonsillectomy with adenoidectomy: T&C: type and cross-match (see blood transfusion) T&S: type and screen (blood; e.g., to prepare for blood transfusion) Tab: Tablet (pharmacy) TAB Therapeutic abortion. Threatened abortion ...
[37] [38] Normal daily temperature variation has been described as 0.5 °C (0.9 °F). [7]: 4012 A raised temperature is not always a fever. [37] For example, the temperature rises in healthy people when they exercise, but this is not considered a fever, as the set point is normal. [37]
Helium has a negative Joule–Thomson coefficient at normal ambient temperatures, meaning it heats up when allowed to freely expand. Only below its Joule–Thomson inversion temperature (of about 32 to 50 K at 1 atmosphere) does it cool upon free expansion. [29] Once precooled below this temperature, helium can be liquefied through expansion ...
Sortable table Abbreviation Meaning ā (a with a bar over it) before (from Latin ante) before: A: assessment a.a. of each (from Latin ana ana) amino acids: . A or Ala – alanine C or Cys – cysteine