▁far ▁greater ▁than ▁its ▁requirements ▁which ▁allows ▁precise ▁control ▁of ▁energy ▁loss ▁by ▁radiation , ▁con ve ction ▁and ▁condu ction . ▁D il ated ▁blood ▁vessels ▁increase ▁perf usion ▁and ▁heat loss , ▁while ▁con str icted ▁vessels ▁greatly ▁reduce ▁cut aneous ▁blood ▁flow ▁and ▁con serve ▁heat . ▁ ▁Control ▁of ▁ev ap oration : ▁the ▁skin ▁provides ▁a ▁relatively ▁dry ▁and ▁semi - imper me able ▁bar rier ▁to ▁fluid ▁loss . ▁L oss ▁of ▁this ▁function ▁cont ributes ▁to ▁the ▁massive ▁fluid ▁loss ▁in ▁burn s . ▁ ▁A est het ics ▁and ▁communication : ▁others ▁see ▁our ▁skin ▁and ▁can ▁assess ▁our ▁m ood , ▁physical ▁state ▁and ▁attract iveness . ▁ ▁Storage ▁and ▁synth esis : ▁acts ▁as ▁a ▁storage ▁center ▁for ▁lip ids ▁and ▁water , ▁as ▁well ▁as ▁a ▁means ▁of ▁synth esis ▁of ▁vit amin ▁D ▁by ▁action ▁of ▁U V ▁on ▁certain ▁parts ▁of ▁the ▁skin . ▁ ▁Ex cret ion : ▁swe at ▁contains ▁u rea , ▁however ▁its ▁concentration ▁is ▁ 1 / 1 3 0 th ▁that ▁of ▁ur ine , ▁hence ▁ex cret ion ▁by ▁swe ating ▁is ▁at ▁most ▁a ▁secondary ▁function ▁to ▁temperature ▁reg ulation . ▁ ▁Abs or ption : ▁the ▁cells ▁compr ising ▁the ▁outer most ▁ 0 . 2 5 – 0 . 4 0   mm ▁of ▁the ▁skin ▁are ▁" al most ▁exclus ively ▁supplied ▁by ▁external ▁o xygen ", ▁although ▁the ▁" cont ribution ▁to ▁total ▁resp iration ▁is ▁neg lig