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FEA slab analysis

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Hello group.
 
I have a question regarding FEA of concrete frame structures: when you do a model of a frame, you basically analyze the moments/shear/axial in the beams and columns. The way you model your structure is to either transfer the tributary area load onto the beams (according to the design code you're using) or
you create a plate element onto which you assign an area load and the software does the same thing for you as in part 1.
 
In either case, as far as i understand, the bending stiffness of the slab is neglected. Even when you model your frame with a plate for the slab, the software just connects the slab to the joints. The slab is not connected to the beams at every point.
So how does that alter the results? Are there any assumptions that are made during this process (by neglecting the slab effect)?
(i'm not referring to earthquake loading where the slab behaves like a diaphragm, but rather in DL/LL bending)
 
 
Thanks.