How does aging affect wound healing?

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Multiple Choice

How does aging affect wound healing?

Aging affects wound healing by slowing several key processes that normally coordinate healing. As tissues age, fibroblasts produce less collagen, so the new extracellular matrix is weaker and the wound takes longer to gain tensile strength. Growth factor signaling also declines with age; both the amount of growth factors produced and the responsiveness of cells to these factors (such as TGF-β, PDGF, and VEGF) are reduced, leading to slower fibroblast proliferation, less matrix deposition, and diminished angiogenesis. Because endothelial cells form fewer new blood vessels, the wound receives less oxygen and nutrients, further slowing healing. The combined effect is delayed wound closure, diminished granulation tissue, and slower remodeling. The statement captures these aging-associated changes—impaired collagen synthesis, reduced growth factor response, slower cell proliferation, and reduced angiogenesis—making it the best explanation for how aging affects wound healing. Statements suggesting enhanced healing or no effect don’t align with the known impact of aging on these processes.

Aging affects wound healing by slowing several key processes that normally coordinate healing. As tissues age, fibroblasts produce less collagen, so the new extracellular matrix is weaker and the wound takes longer to gain tensile strength. Growth factor signaling also declines with age; both the amount of growth factors produced and the responsiveness of cells to these factors (such as TGF-β, PDGF, and VEGF) are reduced, leading to slower fibroblast proliferation, less matrix deposition, and diminished angiogenesis. Because endothelial cells form fewer new blood vessels, the wound receives less oxygen and nutrients, further slowing healing. The combined effect is delayed wound closure, diminished granulation tissue, and slower remodeling.

The statement captures these aging-associated changes—impaired collagen synthesis, reduced growth factor response, slower cell proliferation, and reduced angiogenesis—making it the best explanation for how aging affects wound healing. Statements suggesting enhanced healing or no effect don’t align with the known impact of aging on these processes.

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