Nervous system Facts
Network of neurons that coordinate the actions of a human or an animal and transmits signals between different parts of its body
- The basic function of the nervous system is to send signals from one cells to other, or from one part of the body to others
- Nervous system contains two parts – central and peripheral in most animals
- Central nervous system in vertebrates contains brain, spinal cord and retina
- Peripheral nervous system consists of sensory neurons, ganglia and nerves connecting to each other and the central nervous system
- Neurons send signals to other cells as electrochemical waves
- Sponges have no nervous system
- Nervous system is made up of neurons and glial cells
- Neurons communicate with other cells via synapses
- Earthworms have dual nerve cords running along the length of the body and merging at the tail and the mouth
- There are millions of nerve cells in human body
- The neurons in the human brain are more than 100 billion in count.
- The right side of the brain controls the left side of the body and the left side of the brain controls the right side of body.
- The diameter of a neuro ranges between 4 to 100 microns.
- Neurons grow at the rate of 250,000 per minute in a child developing inside the womb
- The human spinal chord contains 13,500,00 neuros and the cluster of nerves located at the base of spine are most sensitive.
- At any given point of time, the brain has only four percent of its cells active, while the rest are being kept in reserve.
- Nervous system can transmit signals at 100 meters per second
- Sodium ions, potassium and Vitamin B ensure the proper functioning of the nervous system