Although both are classified as amine hormones derived from tyrosine, how do thyroid hormones differ from catecholamines regarding their transport in blood?
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Correct answer: Thyroid hormones are lipid-soluble and require carrier proteins.
Thyroid hormones (T3 and T4) are lipophilic and circulate primarily bound to thyroxine-binding globulin and albumin. In contrast, catecholamines like epinephrine are water-soluble and travel dissolved in the plasma.
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