A friend asks you how exocrine glands differ from endocrine glands. She knows that both form from invaginated epithelium. How do you respond?

Exocrine glands secrete sweat and oil while endocrine glands secrete hormones.

Explanation:

As she knows the endocrine and exocrine glands in respect of their origin from skin, so our answer must be related to the skin so that she can understand easily. So our answer should be as follows -

Endocrine glands are those glands which secrete hormones directly to the blood stream but exocrine glands are those glands which secrete sweat and oils directly to the skin surface. A duct is often present in exocrine glands but endocrine glands lack ducts.