Final answer:
The Sebaceous gland produces a mixture of oily substances and fragmented cells through holocrine secretion, releasing sebum to lubricate and protect the skin.
Step-by-step explanation:
The gland that produces a mixture of oily substances and fragmented cells is the Sebaceous gland. The sebaceous glands are categorized as holocrine glands, which means they release their contents by rupturing the entire gland cell. These glands are responsible for secreting sebum, an oily substance that helps lubricate and protect the skin and hair.
The sebum is composed not only of lipids but also includes the remnants of dead cells that were once part of the gland. When the gland cell accumulates enough sebum, it bursts and releases its contents, after which new gland cells differentiate from surrounding cells to replace those that were lost.