How would it be possible to have the normal amount of a hormone circulating in the blood and yet have symptoms that indicate a shortage of that hormone?

must be at least 50 words

What is the main difference between trace elements and the main elements that make up the body? 1) main elements consist of heavier atoms. 2) trace elements are only needed in small amounts. 3) trace elements consist of heavier atoms. 4) main elements are only needed in small amounts.