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Cellular Thyroid Action

Meaning

Cellular thyroid action refers to the precise molecular events initiated inside target cells upon binding of thyroid hormones, primarily triiodothyronine (T3), to their nuclear receptors. This process is the ultimate determinant of thyroid hormone efficacy and its profound influence on basal metabolic rate, thermogenesis, and protein synthesis across virtually all tissues. The concept moves beyond simple circulating hormone levels to assess the actual biological impact at the cellular machinery level. A robust cellular thyroid action is vital for maintaining optimal energy and metabolic health.