Physical Characteristics of Humans Top Ten Rarest Features


 

Top Ten Rarest Features

Everyone has certain physical characteristics maybe one foot is slightly larger than the other or you're born without wisdom teeth. Most of these physical traits are so slight that we barely notice them. But every now and then we encounter a physical trait that is truly extraordinary ranging from the bizarre to the dangerous. We are counting down the top ten rarest features.

Dextrocardia Situs Inversus

Dextrocardia Situs Inversus

The heart is one of the most important part of the human circulatory system. It provides the body with oxygen and nutrients as well as assisting in the removal of metabolic wastes. In humans the heart is located between the lungs in the left compartment of the chest but in rare cases the heart can exist on the right side of the human body. It is actually a rare congenital condition called dextrocardia. This condition has different levels of severity in the milder form known as embryonic arrest. The heart is simply placed a little off-center within the torso but in the case of situs inversus the heart appears like a mirror image of a normal human. Thorax pushed far to the right side of the body there is nothing inherently dangerous about this condition. But it is commonly associated with other birth defects that can often lead to serious health problems later in life. If an individual does not have additional health defects the only risk arises when CPR is performed on the wrong side of the body. Sometimes leading to internal damage and bleeding. Unsurprisingly this condition is extremely uncommon with just one in every 12,000 19 babies’ developing dextrocardia.

Tongue rolling Facts

Tongue Rolling Facts

The tongue is a superlative organ it helps us taste speak and sing and is one of the strongest muscles in the human body. Animals initially develop taste as a defense mechanism to identify whether items were poisonous or not. In humans the tongue plays an integral role in our enjoyment of food and drink. But the tongue has another function that is far less essential to our survival. The practice of tongue rolling simply involves folding the tongue into one of three shapes. The first is a simple lateral fold, the next is folding in half horizontally and the third is making the triple pipe or cloverleaf shape it turns out. There are many different factors that go into tongue rolling. The first and most important is "genetic rolling" the tongue laterally is a dominant trait which only about 70% of the population has, folding the tongue in half is only possible with 14% of the human population and the cloverleaf is the rarest of all with less than 1% of the population. Completing the task strangely a 1975 twin study found that identical twins were no more likely than fraternal twins, to both have the same phenotype rolling. Scientists also contend that there are other factors that affect an individual's ability to make these shapes such as language. A study showed that native speakers of Hindi and urdu were more likely to make a cloverleaf because their tongues were strengthened from the difficulty of their language.

Is It Possible to Lick Your Elbow?

Is It Possible To Lick Your Elbow

Touching your elbow with your tongue is an extremely rare ability. If you can pull it off, you'll have a party trick for the rest of your life but if not you're in the majority less than 1% of the human population can successfully touch their elbow with their tongue. Unlike tongue folding there's no genetic basis for this ability. It all has to do with the proportion of your body in the length of your tongue to be specific. The feat requires some combination of a short upper arm and an extremely long tongue. Some contend that with enough practice and exercises an individual can become flexible enough to lick their own elbow. But much of the resistance is not muscular, instead it comes from our own bones reaching a limit in the shoulder socket. So, no matter how flexible you become, it will be next to impossible to overcome this limitation. However, if you are really motivated, there are proven examples of people teaching themselves to lick their elbows. Of course, there are probably better uses of time but don't let that discourage you.

Fingerprints Facts

Fingerprints Facts

Our fingerprints are an important feature as they are fully unique to every human being. Human finger prints are detailed difficult to alter and durable over the life of an individual making them suitable as long-term markers of human identity. Of course, they also play an important role in forensics. They may be hired by police or other establishments to find individuals who wish to hide their identity or to classify people who are debilitated or deceased. And thus, unable to identify themselves as in the aftermath of a natural disaster fingerprint analysis and use since the early 20th century has led to many crimes being solved. A dermatoglyphic trimly rare genetic disorder that causes a person to have no fingerprints. There are only 4 known extended families universal that are pretentious by this disorder. People with this condition have fingers that are perfectly smooth with no indents across the surface. Ultimately no health problems stem from this genetic disorder, but it can be very inconvenient when dealing with authorities. There are multiple recorded incidents of patients with a dermatoglyphic Rhine to a country because they could not effectively provide a fingerprint. This happens so often that the condition was playfully dubbed immigration delay disease. Of course, we all know the archetype of a criminal who had their fingerprints removed to avoid capture. So, you can understand authorities’ scepticism when they encounter a dermatoglyphic.

Eyelashes Genetic Mutation

Eyelashes Genetic Mutation

Eyelashes are a classical symbol for beauty. It is especially associated with Western ideals of femininity. Their initial purpose was to keep dust and dirt out of the human eye. Let's like the whiskers on a cat and mouse in fact they are made from identical material but over time longer eyelashes became a demarcation of physical beauty as far back as the Bronze Age in ancient Egypt.  Forms of mascara were used to elongate the eyelash and create an artificial extension. This practice remains common to this day, but certain humans and animals have a genetic mutation called this Tisha. It causes eyelashes to grow from a different part of the eyelid closer to the eye and sometimes on the tear gland. It is common in several types of dogs such as the Pekinese cocker, spaniel Bulldog and poodle. Some believe that it is the result of over breeding dogs into an unnatural state. Because the lashes are usually soft. The condition doesn't pose a huge threat but in certain cases the lashes can cause eye irritation or even corneal damage. Treatment options include manual removal electrolysis, electrocute or cryotherapy and surgery.

Color Blind

Color Blind

We all know that the colors we see represent a tiny fraction of the total colors available in the spectrum of life. The electromagnetic spectrum includes everything from gamma rays, x-rays and ultraviolet light to infrared light microwaves and radio waves. Of this spectrum humans can only turn a miniscule percentage into meaningful data for our brains to process but it turns out even within the visible spectrum. The average human is missing out on a huge number of colors that's because, most humans rely on something called trichromatic color vision. To put it simply our eyes, perceive three primary colors blue, green and red and all other colors are simply a blending of these three. But there are some individuals with a condition called tetrachromacy this means that, "their eyes can perceive a fourth primary color in all the variations on that color" as it blends with the rest of the visible spectrum just like trying to describe a color to someone who is colorblind. It is impossible to know what this fourth primary color looks like apparently at one point. Almost all mammals saw in four primary colors but over time it was reduced to either three or two. That we don't need it for survival it would be cool to experience this fourth spectrum.

HIV

HIV

The human immunodeficiency virus or HIV is the deadliest autoimmune disease in the world, while it usually doesn't kill someone itself. It lowers human's ability to defend other diseases making them extremely susceptible. In these cases, something as innocuous as a common cold or flu can prove fatal. In fact, it's estimated that after contracting the disease most people only have nine to eleven years to live. After decades of outreach and education HIV rates are declining but it still poses one of the most serious problems to world health. Roughly 35 million people are living with HIV at any given time, and about 1 million of them pass away every year. That is what makes the CCR5 protein so miraculous. It is found in rare cases on the surface of white blood cells and has the incredible ability to make certain patients’ immune to HIV. Though the specifics are obtuse, CCR5 is responsible for the spread of HIV and other situations. This means that depending on how your white blood cells react to this single protein. It can determine your susceptibility to HIV and AIDS. Of course, CCR5 is the source of much research as scientists attempt to understand how it affects our body.

Body's Reaction to Cholesterol

Body' Reaction To Cholestrol

This is another example of a genetic mutation with a hugely beneficial impact. It involves the body's reaction to cholesterol which is somewhat complicated. Many people associate cholesterol with reading food labelling, they assume that all cholesterol is bad and avoided like the plague. But the truth is cholesterol is a fatty substance called a lie pet and we need it to survive. The two main types of lipo-protein are high density lipoprotein or HDL which carries cholesterol away from the cells and back to the liver, where it is either broken down or passed out of the body as a waste product. For this reason, HDL is referred to as good cholesterol and low-density lipoprotein or LDL. Which carries cholesterol to the cells that need it, but if there is too much cholesterol for the cells to use, it can build up in the artery walls, leading to disease of the arteries. For this reason, LDL is known as bad cholesterol but there is a rare enzyme known as pcsk9. Which can cleanse the body of virtually. All LDL people who are lucky enough to have this enzyme are unlikely to have heart disease obesity or strokes, of course, pcsk9 is at the center of much medical research.

Sinuses

Sinuses

The sinuses are a connected system of hollow cavities in the skull. The largest sinus cavities are about an inch across others are much smaller. The inside of the nose has small sinuses called terminates. Normally these structures help humidify and filter air. These sinuses actually exist all throughout our body and are essential to our survival. But in certain rare cases our sinuses can extend to the surface of our body. Preauricular sinus is an uncommon birth defect that may be seen during a routine exam of a newborn. It generally appears as a tiny skin lined hole or pit often just in front of the upper ear. Where the cartilage of the ear Rim meets the face. It may occur on one side or both sides of the ear. Affected people usually do not have any additional symptoms unless it becomes infected well. It is not usually unhealthy for a patient. The external sinus holds a social stigma in certain cultures especially in East Asia.

Blood

Blood

Our blood is the most essential part of our circulatory system. Red blood cells carry oxygen to all the cells and tissues in our body. If we lose a lot of blood and surgery or an accident, we need more of it fast. Hence the hundreds of millions of people flowing through blood donation centers across the world and the thousands of vehicles transporting bags of blood to processing centers and hospitals without getting too deep into specifics. Different types of blood have different antigens. These antigens can cause a blood recipient to have a bad reaction. When new blood is introduced to their body of the handful of major blood types. There is only one O negative that is considered the universal donor, but with this said different individuals with O negatives still have a host of antigens that can make their blood hostile to recipients. But there is one subgroup of blood called the restless blood group that is compatible with 99.99% of all blood types. it is nicknamed golden blood. As it is so valuable to patients across the world.

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