MCAT Biology Question 156: Answer and Explanation
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Question: 156
6. An X-ray of the right femur in a child shows that it is shorter than the opposite femur, and below the average length for a child of this age. Which region of the bone is most likely to have an abnormality?
- A. Diaphysis
- B. Metaphysis
- C. Epiphysis
- D. Periosteum
Correct Answer: C
Explanation:
This question is essentially asking where longitudinal growth occurs in bones. The most likely site of abnormalities in this child's femur is the epiphyseal plate, a disk of cartilaginous cells at the internal border of the epiphysis, because the epiphyseal plate is the site of longitudinal growth. Damage to the epiphysis (with or without metaphysis involvement) can imply damage to the epiphyseal plate.