The human body includes the entire structure of a human being and comprises a head, neck, trunk (which includes the thorax and abdomen), arms and hands, legs and feet. Every part of the body is composed of various types of cells, the fundamental unit of life.

At maturity, the estimated average number of cells in the body is given as 37.2 trillion. This number is stated to be of partial data and to be used as a starting point for further calculations. The number given is arrived at by totalling the cell numbers of all the organs of the body and cell types.

Skeletal structure frames the overall shape of the body and does not alter much over a lifetime. General body shape (and female body shape) is influenced by the distribution of muscle and fat tissue and is also affected by various hormones.

The average adult body contains between 5 and 5½ litres of blood and approximately 10 litres of interstitial fluid. The composition of the human body can be referred to in terms of its water content, elements content, tissue types or material types. The adult human body contains approximately 60% water, and so makes up a significant proportion of the body, both in terms of weight and volume. Water content can vary from a high 75% in a newborn infant to a lower 45% in an obese person.

The composition of the human body is made up of a number of certain elements including carbon, calcium and phosphorus.

  • The average human brain has about 100 billion nerve cells.
  • Nerve impulses to and from the brain travel as fast as 170 miles (274 km) per hour.
  • The thyroid cartilage is more commonly known as the adams apple.
  • The only jointless bone in your body is the hyoid bone in your throat
  • It’s impossible to sneeze with your eyes open.
  • Your stomach needs to produce a new layer of mucus every two weeks or it would digest itself.
  • It takes the interaction of 72 different muscles to produce human speech.
  • The average life of a taste bud is 10 days.
  • The average cough comes out of your mouth at 60 miles (96.5 km) per hour.
  • Relative to size, the strongest muscle in the body is the tongue.
  • Human thigh bones are stronger than concrete.
  • When you sneeze, all your bodily functions stop even your heart.
  • Babies are born without knee caps. They don’t appear until the child reaches 2-6 years of age.
  • Children grow faster in the springtime.
  • It takes the stomach an hour to break down cow milk.
  • Women blink nearly twice as much as men.
  • Blondes have more hair than dark-haired people do.
  • There are 10 human body parts that are only 3 letters long (eye hip arm leg ear toe jaw rib lip gum).

men women body parts

  • If you go blind in one eye you only lose about one fifth of your vision but all your sense of depth.
  • The average human head weighs about 8 pounds.
  • Our eyes are always the same size from birth, but our nose and ears never stop growing.
  • In the average lifetime, a person will walk the equivalent of 5 times around the equator.
  • An average human scalp has 100,000 hairs.
  • The length of the finger dictates how fast the fingernail grows. Therefore, the nail on your middle finger grows the fastest, and on average, your toenails grow twice as slow as your fingernails.
  • The average human blinks their eyes 6,205,000 times each year.
  • The entire length of all the eyelashes shed by a human in their life is over 98 feet (30 m).
  • Your skull is made up of 29 different bones.
  • Your ears and nose continue to grow throughout your entire life.
  • After you die, your body starts to dry out creating the illusion that your hair and nails are still growing after death.
  • Hair is made from the same substance as fingernails.
  • The average surface of the human intestine is 656 square feet (200 m).
  • A healthy adult can draw in about 200 to 300 cubic inches (3.3 to 4.9 liters) of air at a single breath, but at rest only about 5% of this volume is used.
  • The surface of the human skin is 6.5 square feet (2m).
  • 15 million blood cells are destroyed in the human body every second.
  • The pancreas produces Insulin.
  • The most sensitive cluster of nerves is at the base of the spine.
  • The human body is comprised of 80% water.
  • The average human will shed 40 pounds of skin in a lifetime.
  • Every year about 98% of the atoms in your body are replaced.
  • The human heart creates enough pressure to squirt blood 30 feet (9 m).
  • You were born with 300 bones. When you get to be an adult, you have 206.
  • Human thighbones are stronger than concrete.
  • Every human spent about half an hour as a single cell.
  • There are 45 miles (72 km) of nerves in the skin of a human being.
  • The average human heart will beat 3,000 million times in its lifetime and pump 48 million gallons of blood.
  • Each square inch (2.5 cm) of human skin consists of 20 feet (6 m) of blood vessels.
  • During a 24-hour period, the average human will breathe 23,040 times.
  • Human blood travels 60,000 miles (96,540 km) per day on its journey through the body.
  • More than half the bones in the human body are in the hands and feet.
  • Everyone is colorblind at birth.
  • Food will get to your stomach even if you’re standing on your head.

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  • The highest recorded “sneeze speed” is 165 km (102 miles) per hour.
  • A newborn baby has 350 bones, but a fully-grown adult has only 206.
  • Blood is a liquid organ.
  • Our lungs inhale over two million liters of air every day, without even thinking. The surface area of the lungs is approximately the same size as a tennis court.
  • Skin is the largest body organ.
  • The average adult is made up of 100 trillion cells.
  • There are more bacteria in your body than the number of cells in your body. There are an estimated 75 to 100 trillion cells in the human body.
  • Our brain is more complex than the most powerful computer and has over 100 billion nerve cells.
  • Capillaries are so small that red blood cells can only travel through them in single file.
  • The cornea, the outermost layer of the eye, is the only living tissue in the human body without blood vessels? It receives nutrients from tears and from the aqueous humor.
  • Each cell in your body has an estimated 6 to 8 feet of DNA.
  • Research has shown that guilt damages your immune system by lowering your immunoglobulin levels.
  • The total length of your circulatory system stretches an amazing 60,000 miles. That is more than twice the distance around the Earth.
  • In one square inch of skin there are four yards of nerve fibers, 600 pain sensors, 1300 nerve cells, 9000 nerve endings, 36 heat sensors, 75 pressure sensors, 100 sweat glands, 3 million cells, and 3 yards of blood vessels.
  • Except for your brain cells, 50,000,000 of the cells in your body will have died and been replaced with others, all while you have been reading this sentence.
  • Your heart beats about 100,000 times in one day and about 40,000,000 times a year. In one hour the heart works hard enough to produce enough energy to raise almost one ton of weight one yard from the ground.

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  • The liver is often called the body’s chemical factory. Scientists have counted over 500 liver functions.
  • The central nervous system is connected to every part of the body by 43 pairs of nerves. Twelve pairs go to and from the brain, with 31 pairs going from the spinal cord. There are nearly 45 miles of nerves running through our bodies.
  • Messages travel along the nerves as electrical impulses. They travel at speeds up to 248 mile per hour.
  • The central nervous system is the master system of all functions within your body and has a reciprocal Neurophysiologic relationship with the Acupressure Meridian and Chakra (Emotional Energy Centers) Systems of energetic function within your being. Subluxations in your spine, cranium and extremities, interfere with the flow of nerve impulse energy information and acupressure meridian energy within your body.
  • The aorta, the largest artery in the body, is almost the diameter of a garden hose. Capillaries, on the other hand, are so small that it takes ten of them to equal the thickness of a human hair.
  • Your body has about 5.6 liters (6 quarts) of blood. These 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 (12,000 miles) – that’s four times the distance across the US from coast to coast.
  • Our eyes can distinguish up to one million color surfaces and take in more information than the largest telescope known to man.
  • Our hearing is so sensitive it can distinguish between hundreds of thousands of different sounds.
  • Our sense of touch is more refined than any device ever created.
  • We give birth to 100 billion red blood cells every day and about two million red blood cells every second.
  • When we touch something, we send a message to our brain at 124 mph.
  • We have over 600 muscles.
  • We exercise at least 30 muscles when we smile.
  • We are about 70 percent water.
  • We make one liter of saliva a day.
  • Our nose is our personal air-conditioning system: it warms cold air, cools hot air and filters impurities.
  • We have copper, zinc, cobalt, calcium, manganese, phosphates, nickel and silicon in our bodies.
  • If you yelled for 8 years, 7 months and 6 days you would have produced enough sound energy to heat one cup of coffee.
  • During the first month of life, the number of connections or synapses, dramatically increases from 50 trillion to 1 quadrillion. If an infant’s body grew at a comparable rate, his weight would increase from 8.5 pounds at birth to 170 pounds at one month old.
  • The average life of a taste bud is 10 days.
  • Margarine is but ONE MOLECULE away from being PLASTIC…
  • Our bodies contain enough water to fill a ten-gallon tank.
  • We have enough carbon to manufacture 900 pencils.

male female reproductive system

  • Fingernails are one of the human body’s strongest components. They contain keratin, which is also found in rhino horns, which refuses to erode after death.
  • Babies are not fully naked in the womb. In fact, their entire bodies are usually covered in a thin layer of dark hair by the end of the fifth month of pregnancy, which disappear when the baby is born.
  • People blink once every four seconds. That’s because the eyelashes act as windscreen wipers, keeping dust and grime from getting into the eye itself.
  • Humans are one of the only mammals who are unable to ‘turn’ their ears in order to hear approaching predators.
  • An embryo is genderless for the first 6-8 weeks of pregnancy. Only after that the body decides whether the baby will be a boy or girl through dominant hormones that emerge.
  • Every tongue has its own individual print, which is unique to each person.
  • The big toe is actually one of the most important elements within the body, as it balances the skeleton and enables the owner to move forward when walking without it, we would simply fall over.
  • If a person has two-thirds of their liver removed from trauma or surgery, it will grow back to its original size in four weeks time.
  • A person can live without food for about 40 days, but only about 7 days without water, 6-8 minutes without air, and literally an instant without Life Force.
  • The odds of being struck by lightning are about 600,000 to one.
  • It is normal to lose 100 hairs per day from the scalp.
  • There are more bacteria in your mouth than the human population of US and Canada combined.
  • There are more than 1,000 chemicals in a cup of coffee. Of these, only 26 have been tested, and half caused cancer in rats.
  • The average human body contains enough: Sulfur to kill all fleas on an average dog, Carbon to make 900 pencils, Potassium to fire toy cannon, Fat to make 7 bars of soap, Phosphorus to make 2,200 match heads, and enough water to fill a ten gallon tank.
  • If you could save all the times your eyes blink in one lifetime and use them all at once you would see blackness for 1.2 years!
  • In one square inch of skin there are four yards of nerve fibers, 1300 nerve cells, 100 sweat glands, 3 million cells, and 3 yards of blood vessels.
  • Except for your brain cells, 50,000,000 of the cells in your body will have died and been replaced with others, all while you have been reading this sentence.
  • The adult heart beats about 40,000,000 times a year. In one hour the heart works hard enough to produce enough energy to raise almost one ton of weight one yard from the ground.
  • The liver is often called the body’s chemical factory. Scientists have counted over 500 liver functions.
  • The central nervous system is connected to every part of the body by 43 pairs of nerves. Twelve pairs go to and from the brain, with 31 pairs going from the spinal cord. There are nearly 45 miles of nerves running through our bodies.
  • Messages travel along the nerves as electrical impulses. They travel at speeds up to 248 mile per hour.

man woman human body explained

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