This hormone is released from the anterior pituitary and causes the release of T3 and T4 from the thyroid gland.
A CRH
B IGF
C TSH
D GH
The correct answer and explanation is:
The correct answer is TSH (Thyroid Stimulating Hormone).
Explanation:
Thyroid Stimulating Hormone (TSH) is a hormone secreted by the anterior pituitary gland. Its primary function is to regulate the production of thyroid hormones, specifically T3 (triiodothyronine) and T4 (thyroxine), from the thyroid gland.
The process begins when the hypothalamus in the brain releases Thyrotropin-Releasing Hormone (TRH). TRH stimulates the anterior pituitary to release TSH into the bloodstream. TSH then travels to the thyroid gland, where it binds to receptors on thyroid cells. This binding triggers the thyroid to produce and release the two key thyroid hormones: T3 and T4.
T3 and T4 are essential for regulating various metabolic processes in the body. They influence the rate of metabolism, energy production, and growth. T3 is more potent than T4, though T4 is produced in greater quantities. Once T4 is released from the thyroid, it is converted into the more active form T3 in tissues such as the liver and kidneys.
The secretion of TSH itself is regulated by a feedback loop. When the levels of T3 and T4 rise in the bloodstream, they signal the hypothalamus and anterior pituitary to decrease the release of TRH and TSH, thus maintaining homeostasis. This negative feedback mechanism ensures that the levels of thyroid hormones remain within a healthy range.
In summary, TSH plays a crucial role in stimulating the thyroid gland to release T3 and T4, which are vital for maintaining normal metabolic function and overall body health.