<prompt> Triiodothyronine T3 as compared to T4:Is more plasma protein boundIs shoer actingIs less potentHas delayed action  <response>: Ref: KDT 6e p247 T3 is the main active thyroid hormone. It is more potent less plasma protein bound and faster acting than T4. However, sho duration of action limits its use for the treatment of hypothyroidism requires life long treatment. T3 is indicated for the treatment of myxedema coma. 