Blood in your legs has to climb back up to the heart against gravity. It has almost no pressure behind it. Watch the muscle pump and one-way valves do the work.
The muscle pump
Venous returnclimbing back to the heart
Three helpers
📷 Reference image
A real labeled picture to compare with the activity above.
Venous Return — OpenStax, CC BY 3.0 (via Wikimedia Commons)
