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Territory were : diseases of the circulatory system ; external causes ; neoplasms ; endocrine , nutritional and metabolic diseases ( including diabetes ) ; and diseases of the respiratory system ( AIHW unpublished ) . The next priority in the primary survey is an assessment of the circulatory status of the patient . A prevalent current use of leeches is for treatment of a circulatory complication that 's common after reconstructive surgeries . " It 's a heartful way to write , more of a circulatory way , to see how things tie in to other things . The heart and writing are often closely associated , particularly in Richardson , notes Erickson : " In an analogy with the physiological operation of the circulatory system as it was understood after [ Sir William ] Harvey , in which the heart both receives and discharges the blood , the cultural ideal of the good woman or good man , for Richardson and many of his contemporaries , is represented by a friendly , undesigning , innocent , worthy , feeling heart ( adjectives drawn from Richardson 's correspondence ) , a heart capable of receiving the most refined impressions , but a heart which also hides nothing and which expresses itself with uncommon openness , spontaneity , and lucidity , whether speaking or writing - - especially writing " ( Erickson 18 ) . Sir Charles Bell 's celebrated Anatomy of Expression noticed the respiratory changes ; and Bain 's and Darwin 's treatises went more thoroughly still into the study of the visceral factors involved , - changes in the functioning of glands and muscles , and in that of the circulatory apparatus . Without the understanding of the circulatory system made possible by Harvey 's pioneering work , the medical miracles that we think are commonplace would be impossible . The blood flow is nearly periodic \ footnote The chaotic behaviour of the cardiac pump allows quick response of the circulatory system to any prompting of the environment . The goal is to postpone collapse of the circulatory system during severe blood loss for at least four hours .