Appositional growth adds tissue _____.

Question

BlackTom AI · Accepted Answer

To understand appositional growth, let’s consider what the term describes and what each option implies.
Option 1: 'during the elongation of long bones' — Elongation of long bones primarily occurs via endochondral (intramembranous-like) processes at the growth plates, not appositional growth from the outside. So this choice misattributes the mechanism to elongation.
Option 2: 'during fetal development' — While growth occurs during fetal development, this statement is too nonspecific. Appositional growth is defined by deposition on the outer surface, not by a developmental stage alone, making this option lacking and not the best descriptor of the process.
Option 3: 'from within the tissue' — Growth from within the tissue describes interstitial (endogenous) growth, where tissue expands by internal expansion of existing matrices, not apposition from the exterior. This makes it incorrect for appositional growth.
Option 4: 'during wound repair' — Wound repair involves multiple processes, including deposition at sites of injury, but appositional growth as a general concept emphasizes addition on the tissue surface rather than a repair-specific context. This reduces its accuracy as a defining statement for appositional growth.
Option 5: 'from outside the existing tissue' — This directly matches the definition of appositional growth: new tissue added to the exterior surface, increasing overall thickness or girth. This is the correct mechanism associated with appositional growth.

BIOL 251 Module 3 Problem Set

Appositional growth adds tissue _____.

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