"the diagram shows human body structures that are coordinated to maintain homeostasis. which row correctly identifies the functions of these structures?
row
bodsystem x organ y
(1) digestion regulation
(2) circulation synthesis
(3) excretion transport
(4) locomotion nutrition
"

The correct answer to this question is number "(1) Digestion Regulation." 

As shown in the image, Digestion is responsible in breaking down carbohydrates and releases sugar into the blood. And the organ Regulation makes hormone A, which releases sugar store in the liver so it enters the blood. On the other hand, hormone B which moves sugar out of the blood into cells.