|Facts About The Human Nervous System
The nervous system, a very essential part of a human being’s body can be categorized under two parts -- central nervous system that includes the spinal cord and the brain, and the peripheral nervous system that comprises of all neuron throughout the body except for those found in the spinal cord or inside the brain. It is responsible for the smooth and uninterrupted functioning of our 5 senses -- sight, hearing, smell, touch and taste. Sodium ions, potassium and vitamin are beneficial and help in proper functional operations of the nervous system.
Below are some of the interesting facts of the nervous system.
On accidentally touching a hot surface, you immediately remove your hand from it. This is because the nerves connected to your skin carry the information of experiencing pain to your brain and the brain instantly orders the exposed muscles to remove your hand away. The entire process is completed in few seconds even before you realize it. This swift coordination amongst the brain with other body parts is aided by the nervous system that transmits impulses at a high speed of hundred meters per second and messages to the brain at a high speed of hundred and eighty miles per hour.
Millions of neurons or nerve cells often exceeding the count of stars in a Milky Way are present in a human being’s body. Only the brain by itself has around hundred billion neurons that can form a six hundred mile long straight line. The spinal cord of humans is made up of almost 13,500,000 neurons and the bunch of nerves present at its base is extremely sensitive.
In a fetus developing in the mother’s womb, the growth rate of neurons is 250,000 nerve cells per minute and by the time the baby is born, its brain has almost up to ten million neurons.
The brain of an adult male weighs 1375 gram on an average and that of a female is around 1275 grams. Every year as one grows older, the brain drops one gram weight.
Neurons are the biggest cells in a human body and can range anything from between four to hundred microns in diameter. However, mitosis does not occur in these cells.
In total 43 separate pairs of nerves connect to the central nervous system, 12 pairs to the brain and 31 pairs to the spinal cord. These nerve duos link the central nervous system to each and every single body part.
It is an interesting fact that in human body, the right brain controls the activities of the left side body and vice-versa. Also, at any point of one’s life only 4 percent of the brain cells stay active. The remaining cells are kept as reserve.
Injury to any part of the human nervous system can result in permanent impairment or paralysis.
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Buzzle.com: Interesting Facts About Nervous System