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.
Return to Safari Planning. The Deserts of Africa -- Unimaginable Beauty. Africa - the second largest continent in the world is also home to the largest desert in the world - the Sahara. In fact there are three deserts on the continent - The Sahara, the Namib and the Kalahari. Together these three amazingly vast and diverse land masses cover a large portion of Africa.