It is part of the plan to kill us. Here is some info about the effects of low oxygen:
What You Need to Know About Brain Oxygen Deprivation
Not all brain injuries involve a blow to the head or lesion. Indeed, your brain can be injured even when nothing comes into contact with your head. Anoxic brain injuries occur when the brain is deprived of oxygen. The aftermath of a lack of oxygen to the brain is largely dependent on the extent of the oxygen deprivation, also known as hypoxia. Some people recover with little to no consequences, while others need years of rehabilitative therapy.
Brain Oxygen Deprivation: The Basics
Doctors typically refer to two distinct forms of oxygen deprivation: anoxic brain injuries occur when the brain is totally deprived of oxygen due to sudden cardiac arrest, choking, strangulation, and other sudden injuries. Hypoxic brain injuries occur when the brain receives less oxygen than it needs, but is not completely deprived of oxygen. Because the effects of the two injuries are similar, many brain experts use the terms interchangeably.
A few seconds of oxygen deprivation won't cause lasting harm, so a child who holds his breath in frustration, a combatant choked unconscious during a Jiu-Jitsu match, and a diver who needs a few extra seconds to come up for air are unlikely to experience brain damage. The precise timeline of anoxic brain injuries depends on a number of personal idiosyncrasies, including overall brain and cardiovascular health, as well as the level of blood oxygenation at the time of injury. Generally speaking, injuries begin at the one-minute mark, steadily worsening thereafter.
How Long Can the Brain Go Without Oxygen? A Timeline
Between 30-180 seconds of oxygen deprivation, you may lose consciousness.
At the one-minute mark, brain cells begin dying.
At three minutes, neurons suffer more extensive damage, and lasting brain damage becomes more likely.
At five minutes, death becomes imminent.
At 10 minutes, even if the brain remains alive, a coma and lasting brain damage are almost inevitable.
At 15 minutes, survival becomes nearly impossible.
There are, of course, exceptions to every rule. Some training routines help the body make more efficient use of oxygen, enabling the brain to go longer periods without this vital element. Free divers routinely train to go long periods without oxygen, and the current record holder, Aleix Segura held his breath for 24 minutes and 3 seconds without sustaining brain damage!
Why Does the Brain Need Oxygen?
The brain represents just 2% of a person's body weight, yet it uses about 20% of the body's oxygen supply. Without it, the brain can't perform even the most basic functions. The brain relies on glucose to power the neurons that control everything from conscious functions like planning and thought to automatic, unconscious processes like managing heart rate and digestion.
Without oxygen, the brain's cells cannot metabolize glucose, and therefore cannot convert glucose into energy. When your brain is deprived of oxygen, then, the ultimate cause of brain death is inadequate energy to power the brain's cells.
Most Common Signs of Oxygen Deprivation
Most cases of oxygen deprivation have an immediate, obvious cause. A person is at risk of oxygen deprivation under a number of circumstances, including:
Strangulation, which blocks blood flow to the brain, thereby preventing oxygen from getting to the brain's cells.
Cardiac or respiratory arrest due to accidents, heart attacks, strokes, and similar catastrophic events.
Choking.
Drowning.
Electrocution.
Brian tumors that impede blood flow.
Heart arrhythmias.
Smoke or carbon monoxide inhalation.
Extremely low blood pressure, which is common when the body goes into shock due to other injuries.
Poisoning, including via overdose of prescription and illicit drugs or alcohol.
Broken or compressed trachea.
Birth-related injuries in newborns.
Early signs of oxygen deprivation include:
Changes in heart rate.
Decreased circulation in the hands or feet.
Parts of the body turning blue.
Fainting, seeing spots, or being unable to think clearly.
Decreased judgment or awareness.
Seizures.
Inability to follow directions or complete complex tasks.
Read the full article here:
https://www.spinalcord.com/blog/what-happens-after-a-lack-of-oxygen-to-the-brain
