Exhibit 5-5
Probability Distribution 
-Refer to Exhibit 5-5. The variance of x equals
Definitions:
Endogenous Substance
A compound or chemical that is produced within an organism or a biological system rather than being introduced from the environment.
Gastric Acid
The hydrochloric acid secreted by the stomach lining, essential for the digestive process.
Neurotransmitter
Chemical substances that transmit signals across a synapse from one neuron to another.
Serotonin
A neurotransmitter that affects mood, appetite, sleep, and other cognitive and physiological processes.
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