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The Integumentary System True / False 1. The less subcutaneous fat a person has, the better the body's ability to insulate itself. 2. Aging increases the activities of the sebaceous glands; therefore, older skin is transparent, and more dry and fragile (friable) than youthful skin. 3. Keratinocytes, a principle cell of the epidermis, produce keratin, which waterproofs and protects skin. 4. Skin color is due to the presence of melanin, carotene, and hemoglobin. 5. The skin has absorptive powers, which are the basis for applying medications transdermally (through the skin)