What Is the Mechanism of Marrow Cavity Enlargement in a Long

question 63

Multiple Choice

What is the mechanism of marrow cavity enlargement in a long bone?

• A) There is no mechanism; once formed, the marrow cavity does not change in size.
• B) As bone matrix is added to the external surface, osteoclasts remove matrix in the center of the bone to enlarge the cavity.
• C) Blood vessels entering the marrow cavity enlarge it by eroding away the inner surface of the bone.
• D) The bone marrow cavity only increases in length, as the epiphyseal plates move apart.
• E) None of the answers are correct.

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