Dissecting dead bodies

In medical school you have to take anatomy class and dissect cadavers (dead-bodies) of non-Muslims and maybe Muslims (I am not sure if there are any Muslims that donate their body after they die so I think all the cadavers are non-Muslims).

1) Do you have to do ghusl after dissecting?

2) Do you have to do wudhu after dissecting?

3) How many times do you have to wash your hands?

4) If you touch the clothes you dissected in after you do wudhu or wash your hands do your hands or things the clothes touches like your bag become napaak?

5) Does the rulings for questions 1-4 change weather the dead-body is of a Muslim or non-Muslim?