Muscle contractions in the lessen legs work as pumps, and elastic vein partitions help blood return to the guts. Very small valves inside the veins open as blood flows toward the guts, then near halt blood from flowing backward. We operate labs in our apply to determine what else https://hectorntxim.onesmablog.com/प-र-क-नस-क-इल-ज-fundamentals-explained-58650174