Which type of gland is characterized as coiled structures attached to hair follicles, particularly found in the underarms and genital area?

• A. Eccrine glands
• B. Sebaceous glands
• C. Apocrine glands
• D. Merocrine glands

Answer: (C)

Apocrine glands are specialized sweat glands that are coiled structures associated with hair follicles, primarily located in areas such as the underarms and the genital region. These glands become active during puberty and are responsible for the secretion of a thicker, milky fluid that contains proteins and fatty acids. The secretion from apocrine glands is typically odorless until it comes into contact with bacteria on the skin surface, which can cause body odor.

In contrast, eccrine glands, which are also sweat glands, are more widespread throughout the body and are primarily involved in thermoregulation, producing a watery type of sweat directly onto the skin's surface and not associated with hair follicles. Sebaceous glands, located near hair follicles as well, secret sebum to lubricate the skin and hair, rather than producing sweat. Merocrine glands, another name for eccrine glands, also refer to secretory cells that release their products directly without loss of cytoplasm.

The unique characteristics and locations of apocrine glands make them specifically significant in areas prone to hair follicles and contribute to the distinctive features of body odor and sweat composition in these particular regions.