Most articles in the natural or social sciences have these sections, conveniently labeled to help you read.
Articles in the Humanities read more like complete essays. They are not set up as experiments. They are more of a guided discussion with author observations and commentary throughout. Therefore, they have different parts. The parts may not be labeled, but section headers may guide the reader to different topics of discussion.
Humanities articles are organized around a conversation flow and are designed to be read as presented.