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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.
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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.
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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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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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Decreased pulse rate01:14

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Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
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Hormones and Bone Tissue01:17

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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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Generation of a Mouse Spontaneous Autoimmune Thyroiditis Model
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Hypothyroidism.

Layal Chaker1, Antonio C Bianco2, Jacqueline Jonklaas3

  • 1Academic Centre for Thyroid Disease, Erasmus University Medical Centre, Rotterdam, Netherlands.

Lancet (London, England)
|March 25, 2017
PubMed
Summary
This summary is machine-generated.

Hypothyroidism, a thyroid hormone deficiency, is common but can be fatal if untreated. While levothyroxine treats it, many patients still experience symptoms even with normal biochemical levels.

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Area of Science:

  • Endocrinology
  • Internal Medicine

Background:

  • Hypothyroidism is a prevalent endocrine disorder characterized by thyroid hormone deficiency.
  • Diagnosis relies on biochemical parameters, but the definition and clinical presentation vary widely.
  • Severe, untreated hypothyroidism poses life-threatening risks.

Purpose of the Study:

  • To provide a comprehensive overview of hypothyroidism.
  • To discuss current evidence on diagnosis, treatment, and management.
  • To identify future research directions in thyroid hormone deficiency.

Main Methods:

  • Review of epidemiological data on hypothyroidism.
  • Analysis of clinical manifestations across different demographics.
  • Summary of evidence regarding diagnosis and treatment efficacy.

Main Results:

  • Hypothyroidism presents with diverse symptoms, including fatigue, weight gain, and cold intolerance.
  • Standard treatment with levothyroxine may not resolve all patient complaints.
  • Persistent symptoms in patients reaching biochemical targets warrant further investigation.

Conclusions:

  • Hypothyroidism requires careful diagnosis and management, considering its wide spectrum of presentation.
  • Further research is needed to address persistent symptoms in treated patients.
  • Optimizing management strategies for thyroid hormone deficiency remains a key clinical challenge.