<prompt> Which of the following is the least likely physiological change in pregnancy :Increase in intravascular volumeIncrease in cardiac outputIncrease in stroke volumeIncrease In peripheral vascular resistance  <response>: The increase in cardiac output does not cause increase in BP. This is due to massive fall in peripheral vascular resistance due to smooth muscle relaxant propeies of progesterone. Reference : Duttas Textbook of Obstetrics 7th edition page 53 