If you are talking about the whole body part, "small intestine" is countable, so you would need "a" (or some other suitable determiner). It possible for it to be uncountable, treated as a "substance", but in that case you would probably say "some small intestine". This implies it is not the whole body part.
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GPYIt possible for it to be uncountable, treated as a "substance", but in that case you would probably say "some small intestine". This implies it is not the whole body part...you may also 'highlight' aIn which case, you would say "Bleeaah!"
GPYbut in that case you would probably say "some small intestine".Or of course you could say "part of a small intestine", which in reality would probably be more common.
onizo You see a picture of small intestine. Which is correct?
1. There is small intestine.
2. There is a small intestine. correct