When to take questions during a thesis defense?

I am going do do my thesis defense next week. I am not nervous. On the contrary, I am so over-relaxed that my instincts tell me this will cause a problem during my defense.

I am not sure when to take questions, though:

1. Should I accept the questions during the presentation or should I say that I will answer the questions at the end?


2. I am thinking of going with the second option, answers at the end. However, what if a jury member asks me a question during the presentation?

Edit: My thesis is on computer science. I'm going to defend it in English.