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 world's largest desert is actually the very cold continent of Antarctica. It is the world's driest place, receiving less than two inches of precipitation annually. Antarctica is 5.5 million square miles (14,245,000 square kilometers) in area.utside of polar regions, Northern Africa's Sahara Desert is the world's largest desert at more than 3.5 million square miles (nine million square kilometers), which is slightly smaller that the size of the United States, the world's fourth largest country.