A 3-Year-Old Boy Is Evaluated for Delayed Developmental Milestones, Including

question 494

Multiple Choice

A 3-year-old boy is evaluated for delayed developmental milestones, including short stature.  There is no family history of bone conditions.  The family recently immigrated to the United States.  The patient was exclusively breastfed until age 6 months and has since had a varied diet of fruits, vegetables, and meats.  He takes no medications or supplements.  Vital signs are normal.  Physical examination reveals frontal bossing, dental enamel defects, and bilateral, symmetric, bead-like enlargement of the costochondral junctions.  If a histologic examination of the bone is performed, which of the following changes is most likely to be seen in this patient?

• A)Apoptotic osteoblasts
• B)Enlarged osteoclasts
• C)Excessive fibrous tissue replacement
• D)Excessive mineralized matrix
• E)Excessive unmineralized matrix

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Definitions:

Price Floor

A minimum price set by the government or a governing body below which a product cannot be sold legally.

Producer Surplus

The difference between the amount producers are willing to sell a good for and the amount they actually receive.

Price Ceiling

A government-imposed limit on how high a price is charged for a product, service, or commodity, intended to protect consumers from high prices.

Persistent Shortage

A situation where the demand for a good or service consistently exceeds its supply, over a significant period of time.