Does the Nikon D7000 store pictures without a memory card in place?

So silly, but i put the memory card into my computer to look at older photos then a friend of mine was using it to take fairly important photos… It was working normally you could take photos and they would be displayed for a few seconds after as usual, but now i can't see them… Would they be saved or gone?

No, DSLRs have no internal memory. Photos might be displayed but definitely not stored.