Thekey differencebetween thyroxine and triiodothyronine is that甲状腺素包含四个原子iodineper molecule while triiodothyronine contains three atoms of iodine per molecule.
甲状腺是内分泌腺located in the neck area. This gland is important since it produces threehormones. Two of these hormones are essential for regulating metabolism. These two thyroid hormones are thyroxine and triiodothyronine. Both hormones function together in order to control the rate of energy use in our body. The third thyroid hormone is calcitonin and it is important in maintaining calcium homeostasis.
内容
1.Overview and Key Difference
2.What is Thyroxine
3.What is Triiodothyronine
4.甲状腺素和三碘甲醇之间的相似之处
5.Side by Side Comparison – Thyroxine vs Triiodothyronine Neuron in Tabular Form
6。概括
What is Thyroxine?
甲状腺素是一种甲状腺激素,每个分子中含有四个原子。这种激素主要负责代谢的调节。它是酪氨酸激素,分子中有碘。甲状腺素是血液中存在的甲状腺激素的主要形式。

Figure 01: Thyroxine
此外,甲状腺素占甲状腺总激素产生的80%。此外,与三碘甲醇不同,整个甲状腺素起源于甲状腺分泌。此外,甲状腺素的半衰期比三碘甲醇更长。
What is Triiodothyronine?
Triiodothyronine is one of the two major thyroid hormones released by our thyroid gland. Most triiodothyronine in our blood exists as a bound form with proteins. Some amount remains as an unbound form. When measuring the total triiodothyronine, it gives the total amount that circulates in the bloodstream. Normal reference range of the total triiodothyronine is 80 – 200 ng/dL. Below and above this range reflects an abnormality in secreting thyroid hormone and a functional problem of our thyroid gland.

Figure 02: Triiodothyronine
When the total triiodothyronine level is high, we call this condition hyperthyroidism while when it is below, we call it hypothyroidism. Free triiodothyronine is a small percentage which is in the unbound form with proteins. Normal reference range of free triiodothyronine in our bloodstream is 2.3- 4.2 pg/mL. This level represents the immediately available triiodothyronine hormone which can be used. Hence, it is considered that free triiodothyronine is the best representation of the patient’s hormonal status. Furthermore, free triiodothyronine levels are important for the differential diagnosis of hyperthyroidism and non-thyroidal illnesses.
Triiodothyronine plays several vital roles in our body. It regulates the metabolic rate. It also regulates the heart and digestive functions, brain development and function, muscle and bones, etc.
甲状腺素和三碘甲糖胺之间有什么相似之处?
- 甲状腺素和triiodothyronine are two hormones synthesized and released by the thyroid gland.
- They are tyrosine-based hormones.
- 此外,它们主要负责调节我们体内的代谢。
- Production of both hormones decreases due to iodine deficiency.
- Both thyroxine and triiodothyronine are used to treat thyroid hormone deficiency (hypothyroidism).
- These hormones bind with thyroid hormone receptors in order to act.
- 此外,他们与血液一起旅行。
甲状腺素和三碘甲醇之间有什么区别?
甲状腺素和triiodothyronine are two thyroid hormones. However, thyroxine has four iodine atoms per molecule while triiodothyronine has three iodine atoms per molecule. Thus, this is the key difference between thyroxine and triiodothyronine. Furthermore, whole thyroxine originates from the thyroid secretion while most triiodothyronine originates from the deiodination of thyroxine.
The below infographic summarizes the difference between thyroxine and triiodothyronine.
摘要 - 甲状腺素与三碘甲醇
甲状腺素和triiodothyronine are two major hormones produced and released by the thyroid gland. However, the thyroid gland produces more thyroxine than triiodothyronine. The key difference between thyroxine and triiodothyronine is that thyroxine has four iodine atoms per molecule while triiodothyronine has three iodine atoms per molecule. Furthermore, whole thyroxine originates from the thyroid secretion while most triiodothyronine originates from thyroxine deiodination. This is the summary of the difference between thyroxine and triiodothyronine.
Reference:
1.“甲状腺激素。”Wikipedia,Wikimedia基金会,2019年8月25日,Available here.
Image Courtesy:
1.布伦顿(Talk)的“左甲状腺素2DCSD” - 自己的作品(公共领域)通过Commons Wikimedia
2. “Liothyronine2DCSD” By Brenton (talk) – Own work (Public Domain) viaCommons Wikimedia
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