Final answer:
Topical medications utilize the skin's function of selective permeability to deliver medicine into the bloodstream. The skin's other functions include protection, temperature regulation, and vitamin D synthesis.
Step-by-step explanation:
Functions of the Skin and Topical Medication
When topical medication is applied to the skin, it utilizes the selective permeability function of the skin. This allows certain medications to enter the bloodstream through the capillaries in the dermis. The skin's barrier function is designed to protect the body while selectively allowing substances like topical steroids, hormone therapies, and patches for various conditions to pass through.
The key roles of the skin include protecting against microorganisms, preventing water loss, regulating body temperature, and synthesizing vitamin D. The epidermis, particularly, provides protection against environmental hazards and assists in vitamin D synthesis when exposed to UV light. Lastly, the hypodermis is involved in insulation and protection, storing fats crucial for energy and cushioning.