What is neurons ? Structure or parts of Neuron , What is Neurotransmitters ? Types of Neurotransmitters ,
What is Neurons ? The nervous system is composed of more than 100 billion cells known as neurons. A neuron is a basic building block of the central nervous system. It is also known as nerve cells . This are the fundamental units of the brain and nervous system, the cells which are responsible for receiving sensory input from the external world, for sending motor commands to our muscles. This are the cells that transmit chemical and electrical signals in the brain. At birth, the human brain consists of an estimated 100 billion neurons. Unlike other cells, neurons don't reproduce or regenerate. They aren't replaced once they die. Structure or parts of Neuron Neurons vary in their structure, but almost all neurons have four basic parts. These include a soma{ cell body}, dendrites, an axon and terminal buttons. Soma- It contains the nucleus of the cell {the central portion that performs metabolic and reproductive functi...