Which term refers to the delivery of sebum from the sebaceous glands to maintain skin moisture?

The term that refers to the delivery of sebum from the sebaceous glands to maintain skin moisture is "secretion." Sebaceous glands are responsible for producing sebum, an oily substance that helps to keep the skin lubricated and protected. This secretion plays a crucial role in maintaining the skin's barrier function, preventing excessive water loss, and providing hydration.

While excretion generally refers to the elimination of waste products from the body, absorption involves the intake of substances through the skin or other tissues. Evaporation refers to the process of liquid turning into vapor, which is unrelated to the delivery of sebum. Thus, secretion is the most accurate term to describe the process in which sebaceous glands deliver oils to the skin to ensure it remains moist and healthy.