<prompt> Which of the following plasma proteins is not synthesized primarily in liver?AngiotensinogenC-reactive proteinAngiotensin converting enzymeFibrinogen  <response>: Ans. c Angiotensin II converting enzyme The lungs also activate one hormone; the physiologically inactive decapeptide angiotensin I is converted to the pressor, aldosterone-stimulating octapeptide angiotensin II in the pulmonary circulation. The reaction occurs in other tissues as well, but it is particularly prominent in the lungs. Large amounts of the angiotensin-converting enzyme responsible for this activation are located on the surface of the endothelial cells of the pulmonary capillaries. 