30 C.) After MJ and her dad had gone to the radiology department for x-rays. MJ\

Question

30 C.) After MJ and her dad had gone to the radiology department for x-rays. MJ's mother asked the resident if the x-rays would help in the diagnosis of ROD. She was also extremely concerned that ROD would have some lifelong consequences for MJ and her developing bones. The resident said that lab testing would be more helpful in the ROD diagnosis; the x-rays were primarily to make sure MJ had not fractured anything. She continued to educate MJ's mom on how bones develop in children, and to assure her that they would address other concerns with the nephrology service. They still needed the results of the blood tests before they formulated a treatment plan.

The resident explained the process of bone development to MJ's mother. Which of the following statements did the resident make regarding the difference between primary and secondary bone?

a. Secondary bone is mature bone that is much stronger than primary bone due to a higher amount of inorganic matrix. b. Secondary bone is more brittle than primary bone due to its smaller amount of inorganic matrix. c. Primary bone only develops at the primary ossification center, while secondary bone only develops at the secondary ossification center. d. Primary bone only forms during endochondral ossification, while secondary bone only forms during intramembranous ossification

Explanation / Answer

ANSWER IS A

Second bone formed Mature bone Replaces the primary bone Has fully formed lamellae with regularly arranged collagen bundles that are parallel to one another, making it stronger than primary bone Contains higher percentage of inorganic matrix

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