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← Human Body & HealthWhy does excessive sun exposure impair collagen synthesis, leading to premature skin aging?
A)Increased fibroblast proliferation reverses damage
B)Hyaluronic acid production accelerates collagen repair
C)Enhanced angiogenesis supports collagen deposition
D)UVR induces matrix metalloproteinase activation, degrading collagen✓
💡 Explanation
UVR causes photoaging through matrix metalloproteinases (MMPs); these enzymes degrade existing collagen and inhibit new collagen synthesis. because of the inhibited synthesis, skin loses elasticity. Therefore, MMP activation causes premature aging, rather than fibroblast proliferation promoting repair.
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