Which gland produces an oily substance for hair and skin health?

The sebaceous gland is responsible for producing an oily substance known as sebum, which is essential for maintaining the health of hair and skin. Sebum serves multiple purposes, including lubricating the skin and hair, preventing dryness, and providing a barrier against certain pathogens. It is secreted into hair follicles and spreads over the skin's surface, helping to maintain moisture and protect the skin from environmental factors. The oily nature of sebum makes it particularly important for creating a protective layer that can also aid in preventing abrasion and maintaining skin elasticity.

Other glands mentioned, such as the eccrine and apocrine glands, primarily produce sweat. Eccrine glands are responsible for regulating body temperature through sweating and are distributed widely across the skin, particularly on the palms, soles, and forehead. Apocrine glands, on the other hand, are found primarily in areas such as the armpits and groin, and their secretion may contribute to body odor rather than skin and hair lubrication.

The merocrine gland is a term that is often used to describe glands that secrete substances via exocytosis without any loss of cellular material, a mechanism that applies to many types of glands, including those involved in sweat production. However, it does not specifically relate