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Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The...
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Functions of Thyroid Hormones01:18

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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
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The Thyroid Gland01:23

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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
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Major Hormones and Their Functions01:27

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Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Related Experiment Video

Updated: Apr 7, 2026

Author Spotlight: Integrating Ultrasound Imaging with Biochemical Markers for Thyroid Disease Diagnosis
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[Characteristics of postpartum thyroid dysfunction].

A Argatska, B Nonchev, M Obretsova

    Akusherstvo I Ginekologiia
    |July 4, 2015
    PubMed
    Summary

    Thyroid dysfunction following first-trimester abortion is often subclinical and autoimmune. Early detection and monitoring are crucial for managing these thyroid disorders and preventing long-term complications.

    Area of Science:

    • Endocrinology
    • Reproductive Health

    Background:

    • Postpartum thyroid dysfunction is well-studied, but data on early pregnancy abortion complications are limited.
    • Thyroid dysfunction after abortion in the first trimester requires further investigation.

    Purpose of the Study:

    • To characterize thyroid dysfunction in women after first-trimester abortions.
    • To identify risk factors and clinical features of post-abortion thyroid dysfunction.

    Main Methods:

    • Studied 28 women post-first-trimester abortion, assessing thyroid function (TSH, FT3, FT4) and autoantibodies (TgAb, TPOAb).
    • Thyroid ultrasound was performed 3 and 9 months after pregnancy termination.
    • Compared thyroid dysfunction patients with euthyroid controls.

    Main Results:

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    • 10 out of 28 women developed thyroid dysfunction (6 hypothyroidism, 4 thyrotoxicosis).
    • Thyroid dysfunction was often subclinical, diagnosed via hormonal levels.
    • Autoimmune pathogenesis was indicated by positive autoantibody titers.
    • Thyroid volume and hypoechogenicity were higher in women with dysfunction.
    • Dysfunction was transient in 6 patients, persistent in 4 by 9 months.

    Conclusions:

    • Thyroid dysfunction post-abortion is primarily autoimmune, similar to postpartum thyroiditis.
    • Subclinical thyroid disorders are common and may go unrecognized.
    • Active follow-up is essential for high-risk patients to prevent morbidity and detect permanent dysfunction.