15 interesting facts on nervous system in man
Answers
Every person's body contains billions of nerve cells (neurons). There are about 100 billion in the brain and 13.5 million in the spinal cord. The body's neurons take up and send out electric and chemical signals (electrochemical energy) to other neurons
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1) the brain uses most of the energy than the rest of the body. It uses 20% of the total energy.
2) the brain is doing important functions even while sleeping.
3) the structure and density of the brain changes as we learn ,because new neural connections are made in the brain.
4) the fastest signal transmission occur 268 miles per hour in the alpha motor neurons of the spinal cord whereas, the slowest transmission occur within the skin which is 1 mile per hour
4) neurons do not have their own special tissues to divide or repair themselves incase if their is any damage to it. So, their damage is permanent .
5) we lose neurons as we age starting around 20 years . 1/10 of the neurons will be lost by the time we become 75
6) as we become old, the brain shrinks because it losses 1-2 grams every year due to the loss of neurons
7) the brain has approximately 100 billion nerve cells but the spinal cord has only 13.5 million neurons which is not even half of the brain .
8) the brain composition of male and female is different from each other. The male has more grey matter whereas the female has more white matter.
9) the longest nerve is the sciatic nerve. It runs from the spinal cord to the toes on each side of the body.
10) nerves can look different from each other depending on their function. For example, the sensory neurons have dendrites on both the sides of their body , rather than one side
11) neurons have an insulating material over them . It is known as the mylin sheath . It helps the impulses to travel faster , with less energy being lost.
12) in primates like human beings their r neurons which are responsible for behavior like yawning.
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