Which system affects hair growth and skin conditions through hormonal control?

• A. Endocrine System
• B. Reproductive System
• C. Integumentary System
• D. Skeletal System

Answer: (A)

Hormones regulate hair growth and skin behavior. Signals from the endocrine system travel in the bloodstream to receptors in hair follicles and skin glands, influencing the hair growth cycle and things like oil production and skin thickness. For example, androgens can stimulate body hair growth and increase sebum, which can lead to acne, while thyroid hormones affect the texture of hair and the moisture level of skin. Hormonal fluctuations during puberty, pregnancy, or thyroid conditions show how these chemical messages shape hair and skin changes. The endocrine system is the source of these controlling signals, even though the reproductive and integumentary systems are involved in hair and skin processes; the key regulator of these hormonal effects is the endocrine system.