Xi needs to stay awake another hour to study for his english final, so he drinks several cups of cola. when he's done studying, he finds that he can't sleep even though he wants to, he feels agitated, his muscles twitch, his heartbeat is irregular, and he feels nauseated. what is causing xi to feel this way?
a. caffeine
b. insomnia
c. narcolepsy
d. sugar

The correct answer is a. sugar

Explanation:

Even though caffeine is also known for uprising the energy levels to a point where it could cause insomnia, the excess of sugar usually causes an increase in heart rate and insomnia. Also, coca-cola has a bigger amount of sugar than caffeine, so it explains how these high quantities could affect Xi's health.

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bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.