Which of the following is a component of the integumentary system that secretes pheromones?

• A. Apocrine sweat glands
• B. Sebaceous glands
• C. Eccrine sweat glands
• D. Hair follicles

Answer: (A)

Verified step by step guidance

1. Understand the integumentary system: The integumentary system includes the skin and its associated structures such as sweat glands, sebaceous glands, hair follicles, and nails. Its primary functions include protection, thermoregulation, sensation, and secretion.
2. Learn about sweat glands: Sweat glands are divided into two types—eccrine and apocrine. Eccrine sweat glands are responsible for thermoregulation by secreting sweat directly onto the skin surface, while apocrine sweat glands are associated with hair follicles and are found in specific areas like the armpits and groin.
3. Understand apocrine sweat glands: Apocrine sweat glands secrete a thicker, milky fluid that contains proteins and lipids. These secretions can be broken down by bacteria on the skin, producing body odor. Apocrine glands are also known to secrete pheromones, which are chemical signals that can influence social and reproductive behaviors.
4. Differentiate other options: Sebaceous glands secrete sebum, an oily substance that lubricates the skin and hair, but they do not secrete pheromones. Eccrine sweat glands primarily function in thermoregulation and do not produce pheromones. Hair follicles are structures that produce hair and are associated with sebaceous and apocrine glands but do not directly secrete pheromones.
5. Conclude the correct answer: Based on the function and secretion of pheromones, apocrine sweat glands are the correct answer as they are specialized for this purpose.