Why do some hormones, like thyroxin, affect most or all body cells while others only affect a single organ or type of cell?

Question

Quizplus · Accepted Answer

Hormones have specific receptors on certain cells and organs. The cells and organs that have these receptors will be affected by the hormone, while those without the receptors will not be affected. Therefore, hormones like thyroxin that affect most or all body cells must have receptors that are found on almost every tissue, while hormones that affect only a single organ or type of cell have receptors that are usually found only in these specific cells.

Why Do Some Hormones, Like Thyroxin, Affect Most or All