By what age is anatomy and physiology similar to adults?

• A. By age 8
• B. By age 6
• C. By age 10
• D. Only after adolescence

Answer: (A)

The concept being tested is when a child’s body functions become closely like an adult’s. By around eight years old, major organ systems have matured enough that anatomy and basic physiology resemble adult patterns, making clinical assessment and many treatments align with adult expectations. Before eight, ongoing growth means notable differences in organ size, airway dimensions, and function exist, requiring pediatric-specific considerations. After eight, while growth continues and puberty later adds changes, the overall maturation toward adult physiology is already in place, which is why eight is the commonly cited point of adult-like anatomy and physiology.