The document discusses the human excretory system which works to clean, remove, and store waste from the body. It mentions the kidneys, ureters, bladder, and urethra as key components that work together to filter waste from the blood and remove it from the body.

1. 2 The excretory
system

2. the
excretory
system

4. kidneys

6. ureters

8. bladder

10. urethra

16. to clean

18. to remove

20. to store

22. to sweat

24. THE END