Question

After going a long period of time without eating, the intestines release the hormone ghrelin into the bloodstream, which travels to the brain and signals hunger. After eating breakfast, hydrochloric acid and mucus travels through ducts to reach the stomach from the gastric glands and helps break the food down.

What type of glands are the gastric glands?

A.
endocrine glands, because they release their contents into ducts
B.
exocrine glands, because they release their contents into the bloodstream
C.
exocrine glands, because they release their contents into ducts
D.
endocrine glands, because they release their contents into the bloodstream