<prompt> A person stands up. Compared with the recumbent position, 1 minute after standing, theSkin blood flow increasesVolume of blood in leg veins increasesCardiac preload increasesCardiac contractility decreases  <response>: Standing up increases the transmural pressure in the veins of the legs. Because the veins are highly compliant, their volume increases at the expense of central blood volume.A lower central blood volume means reduced cardiac filling pressure preload. Within seconds, the decrease in preload decreases stroke volume, cardiac output, and aerial pressure. 