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The Human Body is a treasure trove of mysteries, one that still confounds doctors and scientists about the details of its working. It’s not an overstatement to say that every part of your body is a miracle. Here are fifty facts about your body that will leave you stunned. The total length of all the blood vessels in the human body is about 100,000 km. On average, a person's respiration rate is one third higher in spring than in autumn. By the end of a person's life, they can recall, on average, around 150 trillion pieces of information. We lose 80% of our body heat from the head.

Human anatomy is the study of the shape and form of the human body. The human body has four limbs (two arms and two legs), a head and a neck which connect to the torso. The body's shape is determined by a strong skeleton made of bone and cartilage, surrounded by fat, muscle, connective tissue, organs, and other structures.

Our body structures are arranged into several different systems, each with its own specific function. The smallest units in the body are CELLS, which share certain characteristics. These tiny structures are collected into TISSUES, which are themselves arranged into ORGANS. Different body systems consist of collections of cells, tissues, and organs with a common purpose.

The skin, hair, and nails form the body?s outer covering, or integument. They help to protect the body?s internal parts from damage and provide a barrier to invasion by infectious organisms. An adult?s skin covers an area of about 2 m2 or 22 sq ft.

The muscular system consists of layers of muscles that cover the bones of the skeleton, extend across joints, and can contract and relax to produce movement.

The skeleton is a strong yet flexible framework of bones and connective tissue. It provides support for the body and protection for many of its internal parts.

This system consists of the heart and a network of vessels that carry blood. It supplies oxygen and nutrients to the body?s cells and removes waste products.

The nervous system is the body?s main control system. It consists of the brain, the spinal cord, and a network of nerves that extend out to the rest of the body.

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This system is a network of vessels that collects fluid from tissues and returns it to the blood. It also contains groups of cells that protect the body against infection.

The respiratory system is centred on the lungs, which work to get life-giving oxygen into the blood. They also rid the body of a waste product, carbon dioxide.

Many body processes, such as growth and energy production, are directed by hormones. These chemicals are released by the glands of the endocrine system.

The digestive system takes in the food the body needs to fuel its activities. It breaks the food down into units called nutrients and absorbs the nutrients into the blood.

The body?s cells produce waste products, many of which are eliminated in urine. The job of the urinary system is to make urine and expel it from the body.

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The male and female parts of the reproductive system produce the sperm and eggs needed to create a new person. They also bring these tiny cells together.

The basic building blocks of the body are tiny structures called cells. The human body contains trillions of cells, which fall into several types ? nerve cells, muscle cells, fat cells, liver cells, and so on ? each with a different function. A typical cell has a central nucleus surrounded by some jellylike material called cytoplasm. Covering the cytoplasm is the plasma membrane. This controls the movement of substances into and out of the cell.

Nerve cells, or neurons, are one of the most numerous types of body cell. Each nerve cell has a central body, containing the cell nucleus, and fibrelike projections, which can be up to 1 m (3 1/3 ft) long. The nervous system contains billions of neurons, which collect and transmit information around the body. The adult brain alone may contain as many as 25 billion neurons.

Cells come in different shapes and sizes, but all have features in common. Most cells have a nucleus. This contains genetic material, which directs the cell?s activities. The cytoplasm contains small structures called organelles. There are several types of organelle, each with a specific job. Mitochondria, for example, produce energy for the cell.

Cells group together to form tissues, each with specific functions. Connective tissue is the most widespread; it separates and supports other tissues and organs, and includes cartilage and bone. Adipose tissue is packed with fat cells, which provide energy storage and insulation. Epithelial tissue protects and lines the surfaces of many body organs. Other types include muscle and nervous tissue.

Tissues are grouped together in the body to form organs. These include the brain, heart, lungs, kidneys, and liver. Each body organ has a specific shape and is made up of different types of tissue that work together. For example, the heart consists mainly of a specialized type of muscle tissue, which contracts rhythmically to provide the heart?s pumping action. But it also contains nervous tissue, which carries the electrical signals that bring about the contractions, and is lined with epithelial tissue.

The brain is the body?s most complex organ. Its main parts include the cerebrum, responsible for thought and reasoning, and the brainstem, which controls vital processes such as breathing. The brain consists mainly of nervous tissue.

Circulatory System

Muscular System

Nervous System

The Fact Of A Body Summary

1. The acid in your stomach is strong enough to dissolve razorblades.
2. The human body is estimated to have 60,000 miles of blood vessels.
3. Humans lose an average of 40 to 100 strands of hair a day.
4. Women’s hair is about half the diameter of men’s hair.
5. The lifespan of a human hair is 3 to 7 years on average.
6. Every inch of the skin, there are about 32 million bacterias.
7. 300 billion new cells are produced every day. 300 million old cells die every minute.
8. The tooth is the only part of the human body that can’t repair itself.
9. On average, your kidneys will filter around 1.3 liters of blood every minute.
10. Men produce around 10 million sperm per day.
11. On average, a woman’s body produces about 1/2 a million eggs.
12. On average, an individual grows over 450 miles of hair in a lifetime.
13. The largest cell in the human body is the female egg and the smallest is the male sperm.
14. There are about one trillion bacteria on each of your feet.
15. A human sneeze creates a blast of air that can be moving more than 100 miles per hour.
16. The average human drinks about 16,000 gallons of water in his or her lifetime.
17. A baby human’s fingerprints are formed after just three months of the pregancy.
18. The brain operates on the same amount of power as 10-watt light bulb.
19. Babies are born with 300 bones, but by adulthood the number is reduced to 206.
20. By the time they are 60 years old, most humans have lost half of their taste buds.
21. The human body has enough iron in it to make a 3 inches long nail.
22. The average human head has about 100,000 hairs.
23. Nerve impulses to and from the brain travel as fast as 170 miles per hour.
24. An adult human body contains approximately 100 trillion cells.
25. There are nearly 46 miles of nerves in an adult’s body.
26. Fingernails grow 4 times faster than toenails.
27. The strongest muscle in the human body is the tongue.
28. The human body is estimated to have 60,000 miles of blood vessels.
29. Everyone has a unique smell, except for identical twins, who smell the same.
30. All babies are color blind at birth, they see only black and white.
31. Your body requires 1000-1500 calories per day just to simply survive: breathing, sleeping and eating.
32. To completely regrow a human fingernail or toenail, all the way from base to tip, takes about 6 months.
33. The brain has approximately 100 billion nerve cells that send and receive information around the body.
34. A normal human being can survive 20 days without eating but can survive only 2 days without drinking.
35. By the time it is seventy years old, your human heart will have beat an average two-and-a-half billion times.
36. The only part of your body that has no blood supply is the cornea in the eye. It gets its oxygen directly from air.
37. In just 30 minutes, the average person’s body produces enough heat to boil a 1/2 gallon of water.
38. Your lungs need a lot of breathing room. The total surface area of the lungs is approximately equal to the size of a tennis court.
39. The human brain cells can hold between 3 and 1000 Terabytes of information. The National Archives of Britain, containing over 900 years of history, only takes up 70 terabytes.
40. The brain only makes up about 2% of the body but uses 20% of the oxygen that enters the bloodstream.