“…The volume of the vasculature increases in pregnancy on account of the growth of the uterine and placental vasculature and also because of the change in the tone and capacity of other blood vessels. The volume of the circulating blood is in ratio to the heart volume and working ability (Kjellberg et al 1949a, by c, Sjostrand 1953, Robbe 1959, Reindell et al 1961. The quantity of blood which circulates in a pregnant uterus has been estimated to be c. 500-700 ml per minute (Assali et al 1953, Metcaye et al 1955, MacClure Browne 1958.…”