<Li> Reflection coefficient (σ) </Li> <P> Disorders of capillary formation as a developmental defect or acquired disorder are a feature in many common and serious disorders . Within a wide range of cellular factors and cytokines, issues with normal genetic expression and bioactivity of the vascular growth and permeability factor vascular endothelial growth factor (VEGF) appear to play a major role in many of the disorders . Cellular factors include reduced number and function of bone - marrow derived endothelial progenitor cells . and reduced ability of those cells to form blood vessels . </P> <Ul> <Li> Formation of additional capillaries and larger blood vessels (angiogenesis) is a major mechanism by which a cancer may help to enhance its own growth . Disorders of retinal capillaries contribute to the pathogenesis of age - related macular degeneration . </Li> <Li> Reduced capillary density (capillary rarefaction) occurs in association with cardiovascular risk factors and in patients with coronary heart disease . </Li> </Ul> <Li> Formation of additional capillaries and larger blood vessels (angiogenesis) is a major mechanism by which a cancer may help to enhance its own growth . Disorders of retinal capillaries contribute to the pathogenesis of age - related macular degeneration . </Li>

Where are continuous capillaries found within the body