Epidermis

• A. Contains active blood supply and connective tissue
• B. Barrier to the outside world; outermost layer
• C. Stores fat and cushions organs
• D. Produces sweat glands

Answer: (B)

The epidermis is the skin’s outer protective layer that acts as a barrier against pathogens and prevents water loss. It’s the outermost part you encounter during venipuncture preparation. It lacks its own blood supply, as nourishment comes from the underlying dermis. That’s why describing it as the barrier and outermost layer fits best. The other statements refer to deeper skin structures: active blood supply and connective tissue reside in the dermis, fat storage and cushioning occur in the hypodermis (subcutaneous tissue), and sweat glands are located in the dermis with their ducts passing through the epidermis.