Difference between endocrine and exocrine glands?

An endocrine gland secretes its products, for example hormones, directly into the blood. ... An exocrine gland secretes its products for example enzymes, into ducts that lead to the target tissue. For example the salivary gland secretes saliva into the collecting duct which leads to the mouth.

glycolysis is a process that fuel your metabolism. it is apart of cellular respiration the process that produce atp.

substitution is the answer in this case