The lethal dose of caffeine is equivalent to approximately:
A) 10 to 20 cups.
B) 30 to 50 cups.
C) 100 cups.
D) There is no lethal dose.
Ans: C) 100 cups.
Explanation: Caffeine produces observable physiological effects on renal system, cardiovascular system and nervous system. Caffeine is a weak diuretic and increases urine output, which may cause electrolyte imbalance. It stimulates heart producing increased rate of contraction and force of contraction, which causes tachycardia. Caffeine is a CNS stimulant, in high doses which causes restlessness and confusion. In very high doses caffeine (140 to 170 mg) can kill a person (say 106.64 cans of red bull taken at a time), which is equal to 60 to 100 cups of coffee.
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