[Bit#46] The Flawless Body is a Lie: Fatal Flaws of the Human Body

1. The Secret of Suffocation: Why Does the Brain Fall for a Completely Fake Signal?

We believe that our brain detects a lack of oxygen when we run out of breath. However, this is a massive misconception. Our bodies cannot sense dropping oxygen levels in real time. The true reason the brain screams in panic is entirely different. It reacts to the carbon dioxide building up in our bloodstream.

Why was such a system created in the first place? Throughout evolutionary history, oxygen was always abundant in the atmosphere. Therefore, a sensor that monitors waste carbon dioxide was far more efficient than a sensor dedicated to tracking oxygen directly. The medulla oblongata in the brain constantly monitors the acidity of the blood. When carbon dioxide accumulates, the blood becomes acidic. At this moment, the medulla sends a powerful emergency signal to the respiratory center.

The real terror begins here. Let us slightly raise only the carbon dioxide concentration in a room filled with plenty of oxygen. Your body has enough oxygen. Your cells are perfectly fine. Yet, the brain is completely fooled. You experience an extreme panic, feeling as though you are suffocating to death right that second. Cold sweat pours across your body, and your heart races as if it might burst. You reach a state of losing your mind and going mad.

The opposite scenario is even more dangerous. Let us completely remove carbon dioxide and slowly drain only the oxygen. The brain senses absolutely no threat. Since carbon dioxide does not build up, the medulla oblongata remains perfectly calm. Humans merely feel a bit drowsy and blissful, slowly drifting off to sleep. And just like that, the heart stops beating.

The agony of suffocation felt by the brain has nothing to do with the actual presence of oxygen. Only the fake signal of carbon dioxide drives humans mad. We are, in fact, surviving every single moment inside a clever illusion created by our own brain.

2. The Trap of Itching: Why Can We Not Stop Scratching Until We Bleed?

Which is more painful, the cut of a blade or an itch spreading across the entire body? Surprisingly, humans find itching much harder to endure. You can tolerate pain, but you cannot resist an itch. You feel compelled to scratch until blood flows. Why is that? A cruel malfunction of the brain is hidden inside this phenomenon.

In the past, scientists believed that an itch was simply a weak form of pain. However, recent studies have revealed a completely different neural pathway. Our skin contains specialized sensors dedicated exclusively to itching. When a mosquito or an allergen touches the skin, a substance called histamine is released. This sensor detects the histamine and sends an itching signal to the brain.

At that moment, the brain issues an immediate command. It tells you to reach out and scratch the area. This is a survival instinct designed to quickly shake off toxins or bugs. Yet, scratching brings temporary relief. Why is that? The act of scratching creates a new pain on the skin. When a powerful pain signal enters, the brain temporarily blocks the existing itch signal. It essentially covers up the itch with pain.

The real trouble comes right after. To reduce the pain, the brain secretes a neurotransmitter called serotonin. This serotonin pulls a reversal trigger. It restimulates the nerves that cause the itch. Ultimately, scratching causes pain, pain releases serotonin, and that very serotonin makes you even itchier, repeating a vicious cycle.

This is the scientific reality of maddening, chronic itchiness. The brain tries to soothe the pain, only to trap itself in a cage of itching. This explains why people cannot stop their hands even when blood is dripping down.

3. The Terror of Silence: Why Do We Hear Bizarre Voices and See Strange Lights in Perfect Quiet?

The human brain is a monster that feeds on external stimuli. Information like light, sound, and touch must constantly flow in for the brain to operate normally. What happens if we completely block all these stimuli? Amazingly, the brain begins to destroy itself. Sensory deprivation experiments, which lock humans inside specially constructed darkrooms or anechoic chambers, demonstrate exactly this.

For the first few minutes, you feel a sense of peace. However, as the clock passes the one-hour mark, the situation changes drastically. When no sound can be heard, your ears become hyper-sensitive. Now, the sound of your own heartbeat echoes as loudly as thunder. You even start to hear the sound of blood rushing through your veins. As external stimuli disappear, the brain maximizes the tiny noises inside you.

An even more terrifying phenomenon occurs next. If absolutely no stimuli enter the brain, the brain falls into a severe state of starvation. Lacking information, the brain starts creating its own information. It is a form of malfunction. Bizarre lights appear out of the empty air. Non-existent voices whisper in your ears. The brain is essentially creating hallucinations and illusions out of fake data.

Why does this happen? The brain has an inherent instinct to perceive and control its surroundings. The moment stimuli drop to zero, the brain loses its grip on reality. It then blurs the boundary between dreams and reality. In the end, humans become trapped in a massive virtual reality of their own making, reaching a state of extreme terror and madness. It is a mechanism through which loneliness and silence damage the brain more brutally than physical weapons.

4. The Pain of Loneliness: Why Does the Whole Body Actually Hurt When the Mind Is Wounded?

Terrible loneliness is not just an emotional problem. It is an existential threat that physically destroys the body. Why do humans feel a maddening agony when they are alone? Neuroscience treats loneliness exactly the same as a physical wound.

There is a region of the brain that becomes active when we are socially isolated. It is the anterior cingulate cortex. Remarkably, this area is the exact same spot that registers pain when you are cut by a knife or burned by something hot. In other words, the brain interprets an emotional wound as real, physical pain. The phrase “my heart aches from loneliness” is medically true.

Why does such a cruel mechanism exist? From an evolutionary biology perspective, loneliness meant death. In primitive times, separating from the pack and being alone meant becoming food for predators. Therefore, our bodies recognize isolation as an emergency state. It sends a powerful warning signal to return to the pack immediately. That signal is the maddening feeling of loneliness and physical pain.

If you ignore this warning and loneliness becomes chronic, the body slowly breaks down. The stress hormone cortisol is released explosively. Immune cells lose their function, triggering chronic inflammation throughout the body. It eats away at a human being from the cellular level.

The loneliness that drives humans mad is, ultimately, a brutal alarm for survival. The brain carves pain into our entire body to prevent us from dying alone. This is the biological reason why humans have no choice but to be social animals.