Skip navigation

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Results 1 - 2 of 2 for Billion
  1. Nerve conduction Video 
    ... made up of two parts. Each part contains billions of neurons. The first part is the central ... signal is called a neurotransmitter. Neurotransmitters allow the billions of neurons in the nervous system to communicate ...
    https://medlineplus.gov/ency/anatomyvideos/000089.htm -
  2. Brain components Video 
    ... brain is composed of more than a thousand billion neurons. Specific groups of them, working in concert, ...
    https://medlineplus.gov/ency/anatomyvideos/000016.htm -