Here's a breakdown:

* Epithelial cells: These cells form sheets that cover the surfaces of the body and line its cavities. They are specialized for protection, secretion, and absorption.

* Glandular epithelial cells: These are a specific type of epithelial cells that are specialized for secretion. They can be either exocrine or endocrine.

* Exocrine glands: These glands secrete their products into ducts that carry the secretions to the surface of the body or into a cavity.

* Endocrine glands: These glands secrete their products directly into the bloodstream.

Examples of exocrine gland cells and their secretions:

* Sweat glands: Secrete sweat, which helps to regulate body temperature.

* Salivary glands: Secrete saliva, which contains enzymes that begin the digestion of food.

* Pancreas: Secrete digestive enzymes and hormones.

* Goblet cells: Secrete mucus, which lubricates and protects the lining of the digestive tract.

* Sebaceous glands: Secrete sebum, an oily substance that lubricates the skin and hair.

So, to answer your question directly, exocrine secretions are created by specialized glandular epithelial cells that are part of exocrine glands.