None. Before you could loose any brain cells, you would pass out and start breathing normally again.
Only if you hold your breath for a REALLY long time, like turning blue.
no you don't lose brain cells you fool
No, you don't lose cells that's a myth
no but you will lose brain cells
sniff gasoline
no cause the brain is at rest!! sleeping does not require effort that brain cells will work!
Lack of oxygen to the brain.
yes it does
No.
yes
No
Brain cells