check up on vs inspect

check up on

verb
  • To examine or inspect something in order to determine its condition; to check out. 

  • To look after or inquire about someone's well-being. 

inspect

verb
  • To examine critically or carefully; especially, to search out problems or determine condition; to scrutinize. 

  • To view and examine officially. 

How often have the words check up on and inspect occurred in a corpus of books? (source: Google Ngram Viewer )