Final answer:
The sebaceous gland is a holocrine gland that produces oils to lubricate and protect the skin and hair. It secretes its products by bursting of cells, and then it regenerates new gland cells to continue its function.
Step-by-step explanation:
The gland that produces a mixture of oily substances and fragmented cells is known as the sebaceous gland. This gland is a type of holocrine gland, which means its secretion method involves the rupture and destruction of the entire gland cell. Inside the gland, cells accumulate secretory products until they burst, releasing sebum, an oily substance that helps to lubricate and protect the skin and hair. Following this release, new gland cells are formed to replace those that were lost, ensuring continuous function.
Sebaceous glands are a part of the exocrine gland system. Exocrine glands are groups of epithelial cells that secrete substances through ducts either to the skin surface or to internal body surfaces that lead to the exterior. These glands play a crucial role in maintaining the health and integrity of the skin by secreting oils that act as a natural barrier. The oils produced by sebaceous glands not only lubricate the skin but also provide waterproofing for both skin and hair, contributing to our overall health.