Capillary rarefaction aging describes progressive loss of capillary density in tissues during aging. Capillaries are essential for efficient oxygen and nutrient delivery and waste removal. With age, endothelial dysfunction, reduced angiogenesis, and increased apoptosis lead to capillary loss. Capillary rarefaction aging reduces microcirculatory efficiency and increases diffusion distances, impairing tissue metabolism. This process contributes to hypertension, muscle weakness, renal dysfunction, and cognitive decline. Reduced capillary networks limit adaptive responses to stress and exercise. Understanding capillary rarefaction aging emphasizes microvascular health as a determinant of tissue function and overall aging outcomes.
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