Aspecific cell that a hormone binds to and acts on is called a

bone cell

liver cell

target cell

blood cell

"Target cells" are specific cells in which hormones bind to act.

Option: C

Explanation:  

Hormones are chemical messengers secreted into blood or extracellular fluid by one cell that affect the functioning of other cells. Hormones affect only a given number of cells called target cells or a target cell consists of receptors through which they responds a particular cell is a “target cell” for a hormone if it contains “functional receptors” for that “hormone” and “cells” which does not have such “a receptor” not influenced openly by that hormone. "Hormones receptors" are set up either on the “surface of the cell” or “within the cell”. It varies through cell to cell.

a problem could be dealing witj emotional stress..all of these factors contribute to emotional stress.