Brain cells never grow back. But sneezing doesn't kill brain cells, and even if it did, you have so many brain cells losing a few would literally make no difference at all.
because if that cell dies then it has a back up
When a cell dies a new cell is created and covers for the dead cell.
Oh yes, when the body dies, the brain also dies.
Plant cells die if they dont have a nucleus because the nucleus is like the brain of the cell. If it doesn't have a nucleus the cell cannot work properly. Such as producing for or releasing waste or reproducing.
The cell will cease to live.
Technically, a virus is closer to a wayward computer program. No cell! The genetic-related information has a way to get into the infectable cell, and then it uses the cell to make viruses. So instead of your brain cell "thinking", it's busy making viruses (usually the cell dies).
The organism will die. The heart pumps blood, which carries oxygen to all parts of the body- including the brain. If the brain is deprived of oxygen for more than 4 minutes, under most circumstances, the brain dies. When the brain dies, the organism dies.
More than one brain cell dies, a series of them do. It is not a really drastic thing as everyone occasionally bangs their head but it is serious in repeated cases. Brain cells are always growing so it will not cause any long-term damage, unless, as i said before, it was repeated often and the head is banged very hard.
It dies.
Most likely it will suffer from severe brain damage and/or muscle deterioration. Better if you don't do it (if possible).
A cell stops growing when it dies.
it becomes new cell