Electrolysis Practice Exam

Lanugo or vellus hairs are classified as an appendage of which gland?

1. Sweat gland

2. Sebaceous gland

3. Endocrine gland

4. Exocrine gland

The correct answer is: Sebaceous gland

Lanugo or vellus hairs are classified as an appendage of the sebaceous gland due to their association with hair follicles. The sebaceous glands secrete sebum, an oily substance that helps to lubricate the hair and skin, providing hydration and protection. Vellus hairs, commonly known as "peach fuzz," are short, fine, and light-colored hairs found on various regions of the body, and they serve to provide some insulation and sensory functions. While sweat glands and endocrine glands play significant roles in the body, they are not directly related to the structure and function of lanugo or vellus hairs. Sweat glands are primarily involved in thermoregulation and excretion through perspiration, while endocrine glands release hormones into the bloodstream to regulate various bodily functions. Exocrine glands encompass both sebaceous and sweat glands where secretion occurs onto epithelial surfaces; however, the question specifically asks for the gland related to lanugo or vellus hairs, which ties directly to the sebaceous gland.