Brown blood is simply darker, less oxygentaed red bllod. It indicates venous blood. The veins carry blood that is circulating back to the lungs and heart to be refreshed (ie: oxygentaed) to then...
Following a 500 ml (+/- 50 ml) whole blood donation, lost volume is replaced within 2-4 hours as fluid is recruited from the interstitial tissue space. Red cell mass is replaced within 2-4 weeks by...