IgA is the main antibody found in breast milk, tears, saliva, and the mucosal secretions of respiratory tract, gastrointestinal tract, and the genitourinary tract.
IgA是乳汁、泪液、唾液中最多的抗体，也是呼吸道黏膜、胃肠粘膜、泌尿生殖道粘膜最常见的抗体。
Genitourinary tract
原声例句
Osmosis-泌尿
英语百科
Genitourinary system
（重定向自Genitourinary tract）
In anatomy, the genitourinary system or urogenital system is the organ system of the reproductive organs and the urinary system. These are grouped together because of their proximity to each other, their common embryological origin and the use of common pathways, like the male urethra. Also, because of their proximity, the systems are sometimes imaged together.