- Sat Aug 30, 2025 5:32 pm#8883
1. The fastest signal transmission in the human body occurs by alpha motor neurons.
2. The brain is about 85% water.
3. By age 20, we begin to lose neurons to aging.
4. By age 75, nearly 1/10 of the neurons die out from your original neuron count.
5. ScientistsTrusted Source is now developing ways to “hack” into the immune system, gaining the ability to control brain cells with a flash of light. The cells can be programmed to react to light through genetic altering
6. As we age, our brain shrinks by about 1-2 grams every year due to the loss of neurons.
7. In the peripheral nervous system, nerve cells can be threadlike—their width is microscopic, but their length can be measured in feet.
8. A man’s brain has 6.5 times more gray matter compared to women, but a woman’s brain has 10 times more white matter compared to men.
9. Electrical impulses within the nervous system are triggered by ions or chemical signals that pass through channels in the neuron.
10. Research shows that being curious increases the number of connections between brain cells.
11. Our forehead and fingertips are the most sensi-tive to pain because of their greater density of nerve fibers which react to a pain trigger.
12. Neurons may look different from one another.
13. A newborn baby’s brain almost triples in size during the course of its first year.
14. There are two parts to the nervous system namely the central nervous system (CNS) and the peripheral nervous system (PNS).
15. The size of the nervous system ranges from a few hundred cells in the simplest worms, to around 300 billion cells in African elephants.
16. The human brain weighs about 3 lbs (1.4 kg or 1336 grams).
17. Involuntary reflexes are not controlled by your brain. They are controlled by a reflex arc.
18. Reflexes that are involuntary are not interpret-ed and processed by the brain.
19. There is a nervous system for controlling the body at rest.
20. Nerve damage is usually irreversible and can result in loss of function of any nerves in the body. This is because the nerve cells do not undergo the process of cell division, and therefore they cannot grow or repair themselves.
21. The brain’s structure is not static; it changes with acquiring new knowledge.
22. Axons and dendrites act as cables to carry messages to and from the brain and spinal cord.
23. Every square inch of your skin contains around 1,300 pain receptors but only about 100 receptors for pressure, 40 for cold, and 6 for warmth.
24. The nervous system can transmit signals at speeds of 328 feet (100 meters) per second, more than 8 times faster than the top speed of Usain Bolt.
25. If we lined up all the neurons in our body it would be around 599 miles long.
26. The hypothalamus is a small part of the brain that regulates body temperature.
27. Damage to the nervous system may result in the functioning of other systems.
28. It would take more than 3,000 years to count all neurons in your brain!
29. The body has its own nervous system that controls the bowel. The enteric nervous system au-tomatically regulates bowel movements as a part of digestion.
30. Neurons receive signals in a short antennae-like part called the dendrite, and send signals to other neurons with a long cable-like part called the axon. An axon can be up to a meter long.
2. The brain is about 85% water.
3. By age 20, we begin to lose neurons to aging.
4. By age 75, nearly 1/10 of the neurons die out from your original neuron count.
5. ScientistsTrusted Source is now developing ways to “hack” into the immune system, gaining the ability to control brain cells with a flash of light. The cells can be programmed to react to light through genetic altering
6. As we age, our brain shrinks by about 1-2 grams every year due to the loss of neurons.
7. In the peripheral nervous system, nerve cells can be threadlike—their width is microscopic, but their length can be measured in feet.
8. A man’s brain has 6.5 times more gray matter compared to women, but a woman’s brain has 10 times more white matter compared to men.
9. Electrical impulses within the nervous system are triggered by ions or chemical signals that pass through channels in the neuron.
10. Research shows that being curious increases the number of connections between brain cells.
11. Our forehead and fingertips are the most sensi-tive to pain because of their greater density of nerve fibers which react to a pain trigger.
12. Neurons may look different from one another.
13. A newborn baby’s brain almost triples in size during the course of its first year.
14. There are two parts to the nervous system namely the central nervous system (CNS) and the peripheral nervous system (PNS).
15. The size of the nervous system ranges from a few hundred cells in the simplest worms, to around 300 billion cells in African elephants.
16. The human brain weighs about 3 lbs (1.4 kg or 1336 grams).
17. Involuntary reflexes are not controlled by your brain. They are controlled by a reflex arc.
18. Reflexes that are involuntary are not interpret-ed and processed by the brain.
19. There is a nervous system for controlling the body at rest.
20. Nerve damage is usually irreversible and can result in loss of function of any nerves in the body. This is because the nerve cells do not undergo the process of cell division, and therefore they cannot grow or repair themselves.
21. The brain’s structure is not static; it changes with acquiring new knowledge.
22. Axons and dendrites act as cables to carry messages to and from the brain and spinal cord.
23. Every square inch of your skin contains around 1,300 pain receptors but only about 100 receptors for pressure, 40 for cold, and 6 for warmth.
24. The nervous system can transmit signals at speeds of 328 feet (100 meters) per second, more than 8 times faster than the top speed of Usain Bolt.
25. If we lined up all the neurons in our body it would be around 599 miles long.
26. The hypothalamus is a small part of the brain that regulates body temperature.
27. Damage to the nervous system may result in the functioning of other systems.
28. It would take more than 3,000 years to count all neurons in your brain!
29. The body has its own nervous system that controls the bowel. The enteric nervous system au-tomatically regulates bowel movements as a part of digestion.
30. Neurons receive signals in a short antennae-like part called the dendrite, and send signals to other neurons with a long cable-like part called the axon. An axon can be up to a meter long.
