Match the hormones from the thyroid gland with their...

Match the hormones from the thyroid gland with their descriptions.
(1) thyroxine
A. most potent at controlling metabolism
(2) triiodothyronine
B. regulates blood calcium
(3) calcitonin
C. has four iodine atoms

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Key Concepts

Thyroid Hormones

Thyroid hormones are bioactive compounds produced by the thyroid gland that regulate key physiological processes such as metabolism, growth, and development. They include iodinated hormones that differ in iodine content and potency, influencing diverse metabolic and developmental pathways.

Thyroxine and Triiodothyronine

Thyroxine (T4) and triiodothyronine (T3) are primary thyroid hormones distinguished by their iodine content—T4 contains four iodine atoms while T3 contains three. Despite T3 being present in lower circulating amounts, it is the more active form, exerting a potent effect on cellular metabolism and overall energy balance.

Calcitonin

Calcitonin is a hormone secreted by the thyroid gland that plays an essential role in calcium homeostasis. It acts to lower blood calcium levels by inhibiting bone resorption, thereby contributing to the regulation of calcium dynamics in the body.

Iodination in Hormone Synthesis

Iodination is the biochemical process by which iodine atoms are added to the precursor molecules in the thyroid, a critical step in the synthesis of active thyroid hormones. This process not only defines the chemical structure of hormones like T4 and T3 but also underpins their physiological activity.

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