How does collagen type III differ from type I in early wound healing, and when is it typically replaced?

Prepare for the Tissue Injury, Healing, and Pain Test. Utilize flashcards and multiple-choice questions with hints and explanations. Ensure you're ready for the exam!

Multiple Choice

How does collagen type III differ from type I in early wound healing, and when is it typically replaced?

In the early stages of wound healing, collagen type III is laid down quickly by fibroblasts to create a loose, provisional extracellular matrix in granulation tissue. This form of collagen is more rapidly produced and forms a flexible scaffold that supports cell migration and new blood vessel growth. As healing progresses and remodeling (maturation) begins, the tissue shifts to strengthening the scar. Collagen III is gradually degraded, and collagen type I is laid down and cross-linked to form thicker, stronger fibers. This transition from type III to type I during the remodeling phase—typically weeks to months after injury—is what increases the tensile strength of the repaired tissue and makes type I the predominant collagen in mature scars.

In the early stages of wound healing, collagen type III is laid down quickly by fibroblasts to create a loose, provisional extracellular matrix in granulation tissue. This form of collagen is more rapidly produced and forms a flexible scaffold that supports cell migration and new blood vessel growth. As healing progresses and remodeling (maturation) begins, the tissue shifts to strengthening the scar. Collagen III is gradually degraded, and collagen type I is laid down and cross-linked to form thicker, stronger fibers. This transition from type III to type I during the remodeling phase—typically weeks to months after injury—is what increases the tensile strength of the repaired tissue and makes type I the predominant collagen in mature scars.

More practice questions