INFLUENCE OF RESPIRATION ON LYMPH-FLOW. 371 



* Influence of the Respiration on the Lymph - Plow. 



During inspiration, when intra- thoracic pressure is lowered, 

 lymph is pressed into the thoracic duct from the abdominal 

 lymphatics. In expiration, when thoracic pressure rises 

 -again, the extra lymph cannot flow back on account of the 

 valves in the lymphatic vessels, and it is consequently 

 driven on to the cervical ending of the thoracic duct. The 

 Breathing movements thus pump the lymph on. 



