The thyroid gland produces two main hormones: triiodothyronine (T3) and thyroxine (T4). Both are crucial for regulating metabolism, energy levels, and overall body function. While they work together, they have distinct roles and potencies. Let's explore their differences.
T3, or triiodothyronine, is the more active form of thyroid hormone. It directly affects the body's cells and is responsible for most of the physiological effects of thyroid hormones.
T4, or thyroxine, is the primary hormone produced by the thyroid gland. While it has some activity, it mainly serves as a precursor to T3.
| Feature | T3 (Triiodothyronine) | T4 (Thyroxine) |
|---|---|---|
| Potency | π₯ More potent (about 4x) | π¦ Less potent |
| Production | π Smaller amount produced by the thyroid | π§ͺ Larger amount produced by the thyroid |
| Conversion | π Not directly converted from T4 | β‘οΈ Converted to T3 in peripheral tissues |
| Direct Action | π― Binds readily to thyroid hormone receptors | π Less affinity for thyroid hormone receptors |
| Half-Life | β±οΈ Shorter half-life | β³ Longer half-life |
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