Inversions can help clear the upper respiratory tract and drain secretions from the nose, allowing freshly oxygenated blood to flow into the oral cavity.
倒置体式能清理上呼吸道，排出鼻腔内的分泌物，让新鲜富氧的血液循环到口腔。
2
There were no significant difference in the prevalence rate of infection among upper respiratory tract, intraabdominal cavity, blood vessel and the other sites infection(P>0.05).