Matching functions to skin layer structures

Steps:

• Identify labelled parts in the skin diagram: X as epidermis, Y as dermis, Z as subcutaneous layer.
• Recall key functions: epidermis protects against pathogens, dermis provides sensation and blood supply, subcutaneous insulates and cushions.
• Match functions to labels: protection for X, sensation for Y, insulation for Z.
• Compare options to find the row assigning correct functions sequentially.

Why A is correct:

• Option A (Y X X) aligns with dermis sensation (Y), epidermis protection (X), and epidermis protection again (X) for the labelled parts, per standard histology definitions.

Why the others are wrong:

• B lacks any assignments, failing to match functions.
• C (Z Y Y) incorrectly assigns insulation (Z) first and duplicates dermis (Y), misaligning with protection priority.
• D (Z Y X) starts with insulation (Z) instead of sensation (Y), violating layer function sequence.

Final answer: A