There are two kinds of neurotransmitters â INHIBITORY and EXCITATORY. Excitatory neurotransmitters are not necessarily exciting â they are what stimulate the brain. Those that calm the brain and help create balance are called inhibitory.here are two kinds of neurotransmitters â INHIBITORY and EXCITATORY. Excitatory neurotransmitters are not necessarily exciting â they are what stimulate the brain. Those that calm the brain and help create balance are called inhibitory.
The largest desert in the world is the interior of Antarctica. This has an area of about 14,000,000 km2 (5,400,000 sq mi). Rainfall in the Antarctic interior is extremely low, down to 20 millimeters (0.8 in) per year. This is partially because it is so cold that all liquid water quickly freezes solid and joins the ice pack.
The Answer: The largest (nonpolar) desert in the world is the Sahara, in north Africa, which spans an area measured at roughly 3.5 million square miles.The United States' contiguous 48 states could easily fit in the desert.t is bordered by the Mediterranean Sea on the north and it spreads all the way down to central Africa, some 1,200 miles south. For a list of the rest of the world's largest desert regions, check out our table of Principal Deserts of the World.