Which is the most abundant prehormone of T3?

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Multiple Choice

Which is the most abundant prehormone of T3?

Explanation:
The main idea is that the body relies on a circulating precursor to supply the active hormone. Thyroxine (T4) is the thyroid’s major secretory product and circulates in much higher amounts than T3. It has a longer half-life, so it stays in the blood longer, acting as a reservoir. Tissues convert T4 into the active hormone T3 as needed via deiodinase enzymes. That conversion is why T4 is the most abundant prehormone for T3. TSH stimulates production of thyroid hormones, and calcitonin is a different hormone involved in calcium regulation, not a precursor to T3.

The main idea is that the body relies on a circulating precursor to supply the active hormone. Thyroxine (T4) is the thyroid’s major secretory product and circulates in much higher amounts than T3. It has a longer half-life, so it stays in the blood longer, acting as a reservoir. Tissues convert T4 into the active hormone T3 as needed via deiodinase enzymes. That conversion is why T4 is the most abundant prehormone for T3. TSH stimulates production of thyroid hormones, and calcitonin is a different hormone involved in calcium regulation, not a precursor to T3.

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