grammar - Difference between 'part' and 'a part'?


This question may seem to be very simple, but something I get confused whenever I want to speak.


I read a book entitled "re-start your English", and saw a sentence.



This is a leg. It is part of your body.


This is a neck. It is 'a' part of your body.



Why didn't they use 'a' in the first sentence? And why did they use one in the second one?


I'm not a native, so I hope you will please understand, even if there's something awkward about my question.




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