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Related Concept Videos

Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...

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Related Experiment Video

Updated: Jul 10, 2026

Automated Measurement of Microcirculatory Blood Flow Velocity in Pulmonary Metastases of Rats
10:56

Automated Measurement of Microcirculatory Blood Flow Velocity in Pulmonary Metastases of Rats

Published on: November 30, 2014

Tissue blood flow in control and cold-adapted hyperthyroid rats.

N J Rothwell, M J Stock

    Canadian Journal of Physiology and Pharmacology
    |August 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Triiodothyronine (T3) increases oxygen consumption in rats. White adipose tissue and liver show increased blood flow, suggesting their role in thyroid thermogenesis, not just brown adipose tissue (BAT).

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    Published on: October 6, 2023

    Area of Science:

    • Endocrinology
    • Physiology
    • Metabolism

    Background:

    • Thyroid hormones, like triiodothyronine (T3), play a crucial role in regulating metabolism and thermogenesis.
    • The specific contributions of various tissues to thyroid-induced thermogenesis are not fully elucidated.
    • Brown adipose tissue (BAT) is traditionally recognized for its thermogenic function.

    Purpose of the Study:

    • To investigate the effects of chronic triiodothyronine (T3) administration on tissue blood flow and oxygen consumption in rats.
    • To determine the role of different tissues, including white adipose tissue (WAT) and BAT, in mediating thyroid thermogenesis.
    • To compare the thermogenic response in control and cold-adapted rats.

    Main Methods:

    • Rats were administered chronic daily injections of triiodothyronine (T3) for 10-14 days.
    • Tissue blood flow was measured using the radioactive microsphere distribution technique.
    • Oxygen consumption and blood oxygen extraction were assessed in vivo, particularly in brown adipose tissue (BAT).

    Main Results:

    • T3 administration significantly increased overall oxygen consumption in both control (24°C) and cold-adapted (5°C) rats.
    • In control rats, T3 increased blood flow to white adipose tissue (WAT) depots and liver, while decreasing it in the spleen.
    • In cold-adapted rats, T3 increased blood flow to epididymal fat and leg muscle, but reduced oxygen consumption in interscapular BAT.

    Conclusions:

    • Thyroid hormone-induced thermogenesis involves multiple tissues beyond brown adipose tissue (BAT).
    • White adipose tissue (WAT), liver, kidney, and gut appear to be significant contributors to thyroid thermogenesis.
    • BAT's contribution to overall thyroid thermogenesis is relatively minor (approximately 7%).