Should you defend your blinds differently at different stages of a tournament?

Meaning in the early stages should you defend a lot tighter and then get a bit looser as the tournament goes on. The further you go in a tournament the more important it becomes to steal blinds so people will raise/shove a lot lighter. Should you tighten up against this or should you call light as well?

For example early in a 6 seater sit and go blinds are 100/200 and stack sizes are 10000 each. You are in the BB with A10 and the button raises to 600. Should you flat call and see a flop or should you 3-bet knowing that they are probably trying to steal? Or is this a hand you can safely lay down at this stage?

The same situation late on in a tournament the button shoves and you just have him covered are you calling or folding? At this stage they could quite possibly be playing any two cards and just attempting to steal.