Hepatic portal system hepatic vein. The hepatic vein subsequently drains into the inferior vena cava. The hepatic artery provides 30 to 40% of the oxygen to the liver, while only accounting for 25% of the total liver blood flow. The rest comes from the partially deoxygenated blood from the portal vein. The liver consumes about 20% of the total body oxygen when at rest. That is why the total liver blood flow is quite high, at about 1 litre a minute and up to two litres a minute. That is on average one fourth of the average cardiac output at rest. Large veins
Proper adjective Proper adjective In English orthography, the term proper adjective is sometimes applied to adjectives that take initial capital letters, and the term common adjective to those that do not. For example, a person from Boston is Bostonian. "Bostonian" is a proper adjective. These terms are used informally only; they are not used by grammarians or linguists. The term "proper noun" denotes a noun that, grammatically speaking, identifies a specific unique entity; for example, "England" is a proper noun, because it is a name for a specific country, whereas "dog" is not a proper noun; it is, rather, a "common noun"