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Thyroxine (T4)

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Pharmacology for Nurses

Definition

Thyroxine (T4) is a hormone produced by the thyroid gland that plays a crucial role in metabolism, growth, and development. It is converted to the more active form, triiodothyronine (T3), in tissues.

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5 Must Know Facts For Your Next Test

  1. Thyroxine (T4) is the primary hormone produced by the thyroid gland.
  2. T4 is converted into T3, which is more biologically active.
  3. Levothyroxine is a common synthetic form of T4 used to treat hypothyroidism.
  4. T4 levels are commonly measured to assess thyroid function and diagnose thyroid disorders.
  5. Both T3 and T4 are regulated by Thyroid Stimulating Hormone (TSH) from the pituitary gland.

Review Questions

  • What role does thyroxine (T4) play in the body?
  • How is T4 related to T3 in terms of biological activity?
  • What synthetic drug mimics the action of thyroxine (T4)?

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