Summary
Thyroxine and triiodothyronine regulate metabolic rate, growth and development.
In depth
Follicular cells make thyroglobulin and iodinate tyrosine; T4 is converted to the more active T3. Calcitonin is made by C cells. Hyperthyroidism (Graves') causes weight loss, anxiety, heat intolerance; hypothyroidism causes fatigue and weight gain.
Thyroid hormones need iodine. They influence nearly all cells. Hypothyroidism is treated with levothyroxine.
Example: congenital hypothyroidism is screened for in newborns.
Frequently asked questions
What is Thyroid Hormones?
Thyroxine and triiodothyronine regulate metabolic rate, growth and development.
Which area of biology covers Thyroid Hormones, and how advanced is it?
Thyroid Hormones is one of the 54 topics in Reproduction & Endocrinology. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Hormones, Pregnancy, Negative Feedback in Endocrine Control.
Can you give an example of Thyroid Hormones?
Iodised salt prevents deficiency.
What should I learn before Thyroid Hormones?
Work through the Beginner topics in Reproduction & Endocrinology first, such as Reproduction, Asexual Reproduction, Sexual Reproduction, then return to Thyroid Hormones. Intermediate topics assume the Beginner vocabulary.
What topics are related to Thyroid Hormones?
The closest topics to Thyroid Hormones are Hormones, Pregnancy, Negative Feedback in Endocrine Control, Endocrine Glands. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Thyroid Hormones?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Thyroid Hormones. To practise the whole of Reproduction & Endocrinology, use the Reproduction & Endocrinology quiz.
How is Thyroid Hormones different from Hormones?
Thyroid Hormones: Thyroxine and triiodothyronine regulate metabolic rate, growth and development. Hormones: Chemical messengers released into the blood that regulate growth, metabolism and reproduction. Read both side by side and note what each one explains.
How should I study Thyroid Hormones step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Hormones and explain the difference aloud. Finally, take the Reproduction & Endocrinology quiz and come back to this page for any question you miss.