When we race walk, for example, part of our healthy heart muscle may want a little more blood and oxygen, so our tiniest blood vessels send a message upstream to the larger vessels to send more. Researchers have found that a chemical in our bodies known to help blood vessels dilate also sends that signal to the larger blood vessels that more blood is needed.
Click here for original story, New target found for disease of the heart’s smallest blood vessels
Source: ScienceDaily