A hormone produced by the pituitary gland at the base of the brain in response to signals from the hypothalamus gland in the brain.
The suffix -tropin indicates “an affinity for”. Thyrotropin has an affinity for the thyroid. Thyrotropin is known also as thyroid stimulating hormone (TSH).
Thyrotropin (or, if you prefer, TSH) promotes the growth of the thyroid gland in the neck and stimulates it to produce more thyroid hormones. When there is an excessive amount of thyroid hormones, the pituitary gland stops producing TSH, reducing thyroid hormone production. This mechanism maintains a relatively constant level of thyroid hormones circulating in the blood.
A hormone that is made by the thyroid gland and is one of the most important thyroid hormones. Four iodine molecules are attached to the molecular structure of thyroxine. Along with the more powerful thyroid hormone triiodothyronine (T3), thyroxine affects almost every process in the body, including body temperature, growth, and heart rate. Also known […]
The larger of the two long bones in the lower leg. The tibia is familiarly known as the shinbone.
- Tibia vara
A condition that is characterized by disturbance of normal growth in the inner part of the upper tibia. Tibia vara causes a bowlegged gait and can impair the knees significantly. It is most common in children of African descent. Treatment usually involves surgery, although a knee-ankle-foot orthosis brace may be used. Also known as Blount […]
- Tibial bowing
Improper growth of the tibia in the leg, causing bowlegs or other leg problems. The tibia may bow anteriorly (in the front) or posteriorly (in the back). See also tibia vara.
- Tibial muscular dystrophy
Muscular dystrophy, tibial.