admin January 4, 2018

Life is complex as there are numerous unsolved biological mysteries waiting to be unveiled. The human body is itself very mysterious in nature. There are several facts about human body which are not known by everyone.

Thanks to the Reddit users who provided perfect answers to the most unsolved biological mysteries ever. Let’s check out 12 such biological mysteries solved by Redditors.

Why do men appear to have a “stitch line” or “scar line” at the base of their ball-sac?

This question was asked by AmericanPixel.

Saying it “started out as a vagina” is an overstatement, but it’s grounded in truth.

When we’re forming in the womb, we start with a shallow slit between our legs. For women, that slit deepens while in men it stitches together.

The left side is grown, the right side is grown, and then they fuse together. Later, the testes descend into them.

Submitted by ManualNarwhal 

 Why does your appetite decrease in extreme heat?

This question was asked by DoTheLaLaLaLaLa.

Your metabolism’s job is to regulate the temperature of your body. “Metabolizing” food is basically like setting it on fire in your body and using the heat for energy.

In the extreme heat, your body temperature is already high. So your body doesn’t burn the energy it has as aggressively (your metabolism slows down) so that you don’t overheat. This decreases your appetite.

It’s also why you have less energy and feel wiped out after a hot day. You still needed that energy, but your body converted less to avoid overheating. Basically, put you in low power mode.

Submitted by bkanber

Why does a hangover get worse as we age?

This question was asked by LebumGermsJr.

Alcohol is metabolized by liver enzymes and first broken down into acetaldehyde – which is our hangover culprit. After that, it is broken down by an enzyme into acetate which eventually turns into carbon dioxide and water. All are then washed out along with sins from the night before…

The number of enzymes used in this two-step metabolism process slowly dwindles as we age, making us less and less efficient at processing the toxins. This means that the asshole acetaldehyde hangs around longer in our aged bodies that it did before, making us feel like we’re slowly dying.

Submitted by marriedtodata 

 Why does adrenaline in certain circumstances give people superhuman strength? (Being able to lift extremely heavy things, etc.)

They can’t test hysterical strength, so we can only hypothesize why adrenaline causes it. More than likely it is because your muscles are under several inhibitory systems, including pain as well as the neurological restriction of simply having not enough signaling at any given time to activate all the muscle fibers in a group. Strength isn’t just about raw strength, it’s about timing; you need one perfectly timed electrical burst to signal all fibers to work in concert when exerting force. The more fibers activated simultaneously, the more strength you’ll have.

Adrenaline most likely acts to remove several different limited systems. Your pain sensation is dulled or removed entirely, your blood vessels are dilated and your muscles are more heavily oxygenated, and your neural activity increases; more brain activity = increased signaling, which means you’re better able to activate more muscle fibers at once.

The reason we can’t do this all the time is fairly obvious – it puts much more strain on the body and consumes far more energy. Since our bodies evolved in times of scarcity, our bodies evolved a logical mechanism for limiting the bodies ability to use its full strength and energy; only when the brain sensed certain stimuli (a tiger, a child in trouble), would it release its natural chemicals that overrode its own internal limiters, allowing for a brief state of higher muscle performance.

Why is it that when you get hit (i.e. bang your head on a corner) you instinctively apply pressure with your hands? Why does that seem to help?

Your body can only process so much sensation at once. By touching the place that you’ve hurt, you’re basically distracting your brain from the sensation of pain by introducing pressure.

It’s another reason why ice packs can help with pain – not only do they reduce swelling, they introduce the cold sensation and give your brain something else to think about other than the pain.

 Why do we forget dreams so quickly?

Think of your brain like a computer. It has different types of memory like a computer. When you are dreaming, the dreams are using the part of your brain that is like RAM to a computer. It is only stored there temporarily until you wake up. Your brain basically shuts off all memory parts of your brain while it is sleeping. You experience them as you sleep but once you wake up they never get put into storage, so it’s like they never happened.

 How does mental or emotional stress manifest with different physical symptoms (i.e. pimples, nausea, panic attacks, etc.)?

When you are faced with danger, the threat of danger, or sometimes, even the idea of danger, your body reacts to what is called the “fight or flight” response, which I’ll call the stress response. Stress is a threat to your well-being, so your body perceives this as a danger.

Your body prepares itself to protect you. It does this by releasing a hormone, epinephrine, aka adrenaline, into your bloodstream. Adrenaline constricts your veins and arteries, as well as increases your heart rate and breathing rate so that oxygen-rich blood can be delivered. It also diverts blood flow away from the digestive system since its not terribly important right now (this causes nausea). This is to prepare you to either fight the danger or flee from it. Either way, you’re going to need lots of oxygen delivered quickly to your muscles.

When your body reacts to mental or emotional, rather than physical stress, it still reacts the same way. Quick anecdote – I suffer from anxiety. About a year ago, I was in a bus accident and got thrown across the bus. It was terrifying (mental stress), and I did a pretty wicked faceplant (physical stress). What I noticed was that my physical reaction was almost identical to a panic attack I had a few months earlier.

Your body is preparing you for some physical throwdown when you’re stressed. But, there’s nothing to fight, especially when it’s something like an essay that’s half done and due in three hours, so you just have to ride out the adrenaline. So, you get a racing heart, hyperventilation, numbness in the fingers and toes, nausea, inability to stay still.

If smell is based off your nose reacting to particles, how do predators like sharks smell, for example, “a single drop of blood from over two miles away”?

They can’t until some of the particles travel the 2 miles to reach them. But they can detect very low concentrations of particles, so it doesn’t take much for them to notice it, and then they can locate the source.

Why do primitive animals/species know how to animal/specie by themselves, while us humans have to be taught since birth almost everything?


Actually, humans are born with the innate knowledge and ability to survive as is necessary for a baby. We’re born with a suckling instinct, for example, to latch onto nipples and draw food. We also have all the autonomic reflexes already, such as ticklishness, breathing, heart rate regulation, etc. These are common to all mammals, of which we are a member.

This is because primates are social animals; we are born into a group collective (a family unit) and predictably have a social group to learn from. You have to remember that when it comes to survival, humans know everything they need to know right when they’re born, because all that is required of them is autonomic in nature (breathing, heart rate, feeding, urinating, defecating, sleeping, waking), and we only require more complicated systems when we’ve grown. Humans as a whole are very weak when they’re first born, and require a great deal of security for quite a long time, compared to other animals. This is likely because we devote such a great percentage of the nutrients we ingest in order to develop our brains, as opposed to most other animals needing only to develop their bodies. This is likely why parents have an overwhelming emotional bond with their children.

Some animals are not social and are therefore unable to learn from others of their species, and so they’re born with (or learn shortly after birth) more complex instincts.

 If our body creates memory cells for immunity after we have an infection or virus, how come cancer survivors are more likely to contract cancer again and die from it?

Cancer isn’t bacteria or virus, it’s your body’s own cells malfunctioning. Normally your immune system can notice when cells are reproducing uncontrollably, but not always. They are your cells, not foreign bodies.

Even when tumors get destroyed, there are often still rogue cancer cells floating around in your blood that gets missed. They’re just too tiny to catch all of them, usually, so there is a chance they’ll re-implant somewhere down the line and begin reproducing again, growing a new tumor.

How do we get diarrhea, and why is all liquidy??

Diarrhea is the result of stool passing through the large intestine too fast and the intestine not being able to absorb all the water. Causes vary from infection to nervousness, to too much fiber. Also, it depends on how what you’re consuming reacts with your body. Alcohol causes some people to get diarrhea because it irritates the stomach lining and your body pushes it through the intestines faster, the same thing goes with spicy foods. Capsaicin reacts poorly with a lot of stomachs and the body doesn’t always break it down hence fire poops. Also, there’s things like IBD and IBS.


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