▁it ▁can ▁be ▁shown ▁that ▁the ▁trans ient ▁forces ▁become ▁relatively ▁more ▁important ▁than ▁vis c ous ▁forces ▁as ▁the ▁animal ▁size ▁increases . ▁ ▁The ▁Card i ov asc ular ▁System ▁▁ ▁The ▁Heart , ▁ar ter ies , ▁and ▁ve ins ▁( a ▁network ▁of ▁tub es ▁to ▁carry ▁blood ) ▁const itute ▁the ▁card i ov asc ular ▁system ▁or ▁circul atory ▁system ▁of ▁our ▁body ▁which ▁trans ports ▁the ▁blood ▁throughout ▁the ▁body . ▁The ▁heart ▁can ▁be ▁thought ▁of ▁as ▁a ▁mus cular ▁p ump , ▁consisting ▁of ▁four ▁ch amb ers , ▁and ▁p uls atile ▁mus cles ▁which ▁p ump ▁and ▁circul ates ▁the ▁blood ▁through ▁the ▁vas cul ature . ▁ ▁Ar ter ies , ▁ar ter i oles , ▁cap ill aries , ▁ven ules , ▁and ▁ve ins ▁make ▁up ▁the ▁vas cul ature . ▁The ▁card i ov asc ular ▁system ▁circul ates ▁about ▁ 5 ▁lit ers ▁of ▁blood ▁at ▁a ▁rate ▁of ▁approximately ▁ 6 ▁l / m . ▁The ▁pul mon ary ▁and ▁the ▁system ic ▁circul ations ▁are ▁the ▁two ▁parts ▁of ▁the ▁vas cul ature . ▁The ▁pul mon ary ▁circul ation ▁system ▁consists ▁of ▁the ▁network ▁of ▁blood ▁vessels ▁from ▁the ▁right ▁heart ▁to ▁the ▁l ungs ▁and ▁back ▁to ▁the ▁left ▁heart . ▁The ▁rest ▁of ▁the ▁blood ▁flow ▁loop ▁is ▁called ▁system ic ▁circul ation ▁system . ▁The ▁pul mon ary ▁and ▁system ic ▁circul ations ▁take ▁the ▁blood ▁through ▁large ▁ar ter ies