kidney being connected with bladder

例句：

1. 1. The kidney is responsiblefor filtering waste products from the blood.
   肾脏负责过滤血液中的废物。
2. 2. Kidneyfailure can lead to serious health problems ifleft untreated.
   如果不治疗，肾衰竭可能会导致严重的健康问题。
3. 3. The patient's kidneyfunction was tested and found to benormal.
   患者的肾功能测试结果显示正常。