Capillary filtration releases 20 liters of plasma into the tissues each day and 17 liters returns straight to the blood vessels. How much is left for the lymphatic system to drain?

1. In humans, 20 liters of plasma is released into the interstitial space of the tissues each day due to capillary filtration. 2. Of this, 17 liters is reabsorbed directly by the blood vessels. 3. Subtracting gives 20 liters minus 17 liters, which leaves 3 liters. 4. The lymphatic system drains those 3 liters and empties them back into the bloodstream through a series of vessels, trunks and ducts. 5. Seven liters and ten liters match neither the filtered volume nor the reabsorbed volume, so both are invented figures. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 21 "The Lymphatic and Immune System", section 21.1 Anatomy of the Lymphatic and Immune Systems_