What are the functions of nerve cells?

Nerve cells or neurons are specialized cells in the central nervous system. They serve several functions including: 

• Transmission of messages from external stimuli to the central nervous system
• Helping the body to respond to surrounding physical and chemical stimuli
• Regulation of voluntary and involuntary movements of the body
• Enabling smooth transmission of messages, which helps establish communication between the central nervous system and other parts of the body
• Enabling smooth conduct of metabolic activities