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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Definitions:

Jean Piaget

A Swiss psychologist known for his theory of cognitive development that describes how children's intellect grows through stages.

Formal Operations

Formal operations refer to the final stage of cognitive development in Piaget's theory, characterized by the ability to think abstractly and logically.

Gesell's Theory

A developmental theory by Arnold Gesell that suggests children develop in predictable sequences and rates from infancy to adolescence.

Environmental Influence

The effect that surroundings and external conditions have on individuals, including impacts on health, behavior, and well-being.