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

Question

Quizplus · Accepted Answer

Thyroid hormone is a small molecule, similar to steroid hormones, and can easily diffuse across the plasma membrane to enter target cells. It does not require a receptor to bind to in order to enter the cell like insulin or glucagon.

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