The part of the brain that dies first without oxygen is the temporal lobe.
The temporal lobe of the brain is sensitive to oxygen deficiency and is where the memory is situated.
A lack of oxygen to the brain for 3 to 9 minutes can result in brain damage that is irreversible.
Time is very important when an unconscious person is not breathing as they are not getting the oxygen needed to their brain.
Permanent brain damage begins after only 4 minutes without oxygen, and death can occur as soon as 4 to 6 minutes later.
Machines called automated external defibrillators (AEDs) can be found in many public places, and are available for home use as well.
Due to insufficient blood flow to the brain, the person may experience headaches, dizziness, dizziness, etc., thereby gradually reducing memory and forgetting things quickly.
Without oxygen the person may experience headaches, nausea, vomiting or abdominal pain as the vital organs struggle to function.
The symptoms would probably then lead to feelings of confusion and, ultimately, sedation.