Thyroid hormone (a small iodinated amine) enters target cells in a manner similar to ________.
A) insulin, because insulin is a small peptide
B) steroid hormones, because both diffuse easily into target cells
C) growth hormone, because the thyroid works synergistically with thyroid hormone
D) glucagon, because the structure of glucagon is similar to that of thyroid hormone

Question

Quizplus · Accepted Answer

Thyroid hormone is a lipid-soluble hormone, and it can diffuse easily through the plasma membrane of target cells. This is also true for steroid hormones, which are also lipid-soluble and diffuse through the membrane to bind to intracellular receptors.

Thyroid Hormone (A Small Iodinated Amine) Enters Target Cells in a Manner