Why do surgical incisions need to be made parallel to collagen fibers?

Surgical incisions that are made parallel to cleavage lines heal faster and with less scarring than those made perpendicular. Parallel incisions disrupt collagen fibers less and require less scar tissue (cells that aid in healing) to close up a wound.

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there is no cure for hiv, although antiretroviral treatment can control the virus, meaning that people with hiv can live long and healthy lives. most research is looking for a functional cure where hiv is reduced to undetectable and harmless levels in the body permanently, but some residual virus may remain. most commonly hiv-antivirals are taken also known as nucleoside/nucleotide reverse transcriptase inhibitors (nrti's).