Volume, Mechanism, and Direction of Flow
In adults, the thoracic duct transports up to 4 L of lymph per day.
The lymph transport in the thoracic duct is mainly caused by the action of breathing, aided by the duct's smooth muscle and by internal valves which prevent the lymph from flowing back down again.
There are also two valves at the junction of the duct with the left subclavian vein, to prevent the flow of venous blood into the duct.
Read more about this topic: Thoracic Duct
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