Patient Care Technician Certification (PCTC) AMCA Practice Exam

The integumentary system produces what?

1. Melatonin

2. Melanin

3. Collagen

4. Keratin

The correct answer is: Melanin

The integumentary system, which encompasses the skin, hair, nails, and associated glands, is responsible for the production of melanin. Melanin is a pigment that gives color to the skin, hair, and eyes and plays a crucial role in protecting the skin from the harmful effects of ultraviolet (UV) radiation. Its production occurs in specialized cells called melanocytes, located primarily in the epidermis, the outermost layer of the skin. The presence of melanin is significant for skin health, as it can absorb UV radiation and reduce the risk of skin damage and certain types of skin cancer. A higher concentration of melanin results in darker skin tones, while lower levels lead to lighter skin tones. This is important not only for aesthetic reasons but also for overall skin protection. While other substances such as keratin, collagen, and melatonin are also associated with the integumentary system, they serve different functions. Keratin is a protein that provides structure and resilience to hair and nails. Collagen is a vital structural protein that helps maintain skin elasticity and strength. Melatonin, on the other hand, is primarily produced in the pineal gland in the brain and regulates sleep-wake cycles, not directly related to the integumentary system