The atmosphere is quite dusty, giving the Martian sky a light brown or orange-red color when seen from the surface; data from the Mars Exploration Rovers indicate that suspended dust particles of roughly 1.5 micrometres diameter.
Glutamate is a powerful excitatory neurotransmitter that is released by nerve cells in the brain. It is responsible for sending signals between nerve cells, and under normal conditions it plays an important role in learning and memory.
DebraMillet/iStock/Getty Images. Most people know glutamate as monosodium glutamate, a flavor enhancer in food. A simple but more important function of glutamate, however, is its role as a major excitatory neurotransmitter in the brain.Neurotransmitters are chemicals in the brain that allow signals to be conveyed from one neuron to another.ebraMillet/iStock/Getty Images. Most people know glutamate as monosodium glutamate, a flavor enhancer in food. A simple but more important function of glutamate, however, is its role as a major excitatory neurotransmitter in the brain.