Ryanair Initial Practice Exam

How long can the brain be deprived of oxygen before brain damage occurs?

1. 1-2 minutes

2. 3-5 minutes

3. 6-8 minutes

4. 10-12 minutes

The correct answer is: 3-5 minutes

The correct answer is based on well-established medical understanding regarding oxygen deprivation and brain health. The brain is highly sensitive to oxygen levels, and after about three to five minutes without oxygen, it begins to suffer significant damage. During this period, brain cells can start to die, leading to irreversible consequences such as cognitive impairment or even brain death if oxygen deprivation continues. While it may be known that some brain functions can begin to deteriorate in as little as one to two minutes of oxygen deprivation, this timeframe is more associated with the onset of confusion or an inability to perform complex tasks rather than definitive brain damage. As for six to eight minutes, while some cases of recovery are noted, this is an extremely critical and dangerous timeframe, and damage may still occur. Beyond ten to twelve minutes, the likelihood of severe, irreversible brain damage becomes almost guaranteed, which further reinforces why the three to five-minute window is crucial for brain health. This timeframe emphasizes the need for quick intervention in medical emergencies to restore oxygen flow to prevent serious brain injury.