Use the following information to answer the next few questions.
The baseball career of Lou Gehrig,a first baseman for the New York Yankees,ended once he became afflicted with amyotrophic lateral sclerosis (ALS).This disease causes the degeneration of motor neurons in the CNS,leading to rapidly progressive weakness,muscle spasticity,and atrophy.Research into the disease has shown that individuals with ALS have higher levels of the neurotransmitter glutamate in their serum and spinal fluid when compared to normal individuals.
-The excitatory effect of glutamate can be found in