Which of the following statements is NOT true about the digestive system and its contribution to homeostasis?

AThe digestive system helps to maintain the correct amounts of nutrients for the body tissues to do its job.

BThe digestive system is responsible for monitoring the oxygen and carbon dioxide amounts in the blood and tissues

CThe digestive system breaks down food sources into the needed nutrients and deposits these nutrients into the blood for use by the cells.

DAll of the above are true.