In our ongoing quest for wonderful facts about all manner of things, we have put together this great list of amazing facts of human body. These are the 10 most wonderful things about our bodies that, hopefully, are news to most of you.
A typical human mouth contains billions of bacteria. If you haven’t brushed your teeth lately, you might well have more bacteria in your mouth right now than there are people living on planet Earth. Scientists have identified more than 700 different species of mouth-dwelling microbes.
Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.
New new skin cells grow at the lowest level of the epidermis, which bonds with the next layer, the dermis. The new skin cells gradually push their way to the top layer. When they reach the top, they die and are "weathered" by the environment and your daily activities. Eventually, the dead cells break away from the epidermis and fall off, making room for newer cells growing up from below. It takes roughly one month for new cells to get all the way to the top layer, meaning the skin you have a month from today will be completely new compared to the skin you have now.
If you're wondering exactly how many skin cells fall off, get ready for some staggering numbers. Scientists estimate that the human body is made up of around 10 trillion cells in total. Your skin makes up about 16 percent of your body weight, which means you have roughly 1.6 trillion skin cells [source: BBC]. Of course, this estimate can vary tremendously according to a person's size. The important thing is that you have a lot of skin cells. Of those billions of skin cells, between 30,000 and 40,000 of them fall off every hour. Over a 24-hour period, you lose almost a million skin cells [source: Boston Globe].
In their first weeks and months, babies learn to use their eyes – actually their eyes “learn” how to see. While each eye has the physical structure it needs to begin to see normally, the two eyes haven’t learned to work together yet – and this “binocular vision” develops quickly throughout the first few weeks and months of life.
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The cornea has fixed focusing capabilities just like a contact lens. It is commonly referred to as the window into the eye. Light is focused while passing through the cornea, delivering an image to the retina, so you can see.
The cornea is the only organ in the entire human body that has no blood supply. It gets oxygen directly through the air.
Sources: [1],[2],[3]
Number 10: The number of bacteria in a person’s mouth is equal to the number of people living on Earth, or even more.
A typical human mouth contains billions of bacteria. If you haven’t brushed your teeth lately, you might well have more bacteria in your mouth right now than there are people living on planet Earth. Scientists have identified more than 700 different species of mouth-dwelling microbes.
Number 09: Over the course of just one day, our blood ’runs’ the distance of 19,312 kilometers.
Your body has about 5.6 liters of blood. This 5.6 liters of blood circulates through the body three times every minute. In one day, the blood travels a total of 19,000 km —that's four times the distance across the US from coast to coast.Number 08: The heart beats 35 million times a year. Yes, 35 million. A year!
Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.
Number 07: Every day, the human body loses about one million skin cells — that amounts to 2 kilos every year.
Your skin is composed of several layers. The layer you can see is called the epidermis.New new skin cells grow at the lowest level of the epidermis, which bonds with the next layer, the dermis. The new skin cells gradually push their way to the top layer. When they reach the top, they die and are "weathered" by the environment and your daily activities. Eventually, the dead cells break away from the epidermis and fall off, making room for newer cells growing up from below. It takes roughly one month for new cells to get all the way to the top layer, meaning the skin you have a month from today will be completely new compared to the skin you have now.
If you're wondering exactly how many skin cells fall off, get ready for some staggering numbers. Scientists estimate that the human body is made up of around 10 trillion cells in total. Your skin makes up about 16 percent of your body weight, which means you have roughly 1.6 trillion skin cells [source: BBC]. Of course, this estimate can vary tremendously according to a person's size. The important thing is that you have a lot of skin cells. Of those billions of skin cells, between 30,000 and 40,000 of them fall off every hour. Over a 24-hour period, you lose almost a million skin cells [source: Boston Globe].
Number 06: You are taller in the morning than in the evening.
When you sleep, you grow by about 8mm (0.3in). The next day you shrink back to your former height. The reason is that your cartilage discs are squeezed like sponges by the force of gravity when you stand or sit.Number 05: In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
Number 04: A single human blood cell takes only 60 seconds to make a complete circuit of the body.
You have about 5 litres of blood in your body (at least most people do) and the average heart pumps about 70 ml of blood out with each beat. Also, a healthy heart beats around 70 times a minute. So, if you multiply the amount of blood that the heart can pump by the number of beats in a minute, you actually get about 4.9 litres of blood, which is almost your whole body’s worth of blood. In just a minute, the hearts pumps the entire blood volume around your body.Number 03: 100,000 chemical reactions occur every second in our brains
The brain communicates with itself by sending out chemical information from one neuron, or nerve cell to another. Brain chemistry is the sum of all the chemical messaging that takes place in the brain, which allows it to carry out its daily functions, such as generating movement, speaking, thinking, listening, regulating the systems of the body, and countless others. It is estimated that about 100,000 chemical reactions occur every second in our brainsNumber 02: Babies can only see black and white when they are born
Even in the womb babies can tell the difference between light and dark. And at birth, they see shapes by following the lines where light and dark meet. Yet, they are several weeks old before they can see their first primary color – red.In their first weeks and months, babies learn to use their eyes – actually their eyes “learn” how to see. While each eye has the physical structure it needs to begin to see normally, the two eyes haven’t learned to work together yet – and this “binocular vision” develops quickly throughout the first few weeks and months of life.
source:
Number 01: Your cornea is the only part of your body without a blood supply. It gets its oxygen directly from the air
The cornea is the natural, transparent lens located at the front of the eye – a dome shaped surface that covers the iris, pupil, and anterior chamber where a second internal lens exists.The cornea has fixed focusing capabilities just like a contact lens. It is commonly referred to as the window into the eye. Light is focused while passing through the cornea, delivering an image to the retina, so you can see.
The cornea is the only organ in the entire human body that has no blood supply. It gets oxygen directly through the air.
Sources: [1],[2],[3]
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