As long as it was fed oxygen... Yes. I think that's where you're being confused... The brain does play a role in the heart pumping... by keeping the other organs supplying the heart with what it needs.

It's why people that are "brain dead" can be kept "alive" for a while, with a machine that breathes for them. The brains not sending the signals to the lungs to get oxygen in the blood stream to supply the heart with the energy it needs to beat.