Final answer:
Combining alcohol and caffeine enhances the sedative effects of alcohol, does not reduce the risk of alcohol poisoning, and does not improve decision-making and coordination.
Step-by-step explanation:
Combining alcohol and caffeine has several effects on the body. First, it enhances the sedative effects of alcohol, meaning that it can make you feel more relaxed and sleepy. This is because alcohol is a depressant and caffeine is a stimulant, so when they are combined, the sedative effects of alcohol are intensified. Second, combining alcohol and caffeine does not reduce the risk of alcohol poisoning. In fact, it can be dangerous to consume large amounts of caffeine with alcohol because it can mask the effects of intoxication and lead to excessive alcohol consumption. Finally, combining alcohol and caffeine does not improve decision-making and coordination. In fact, it can impair these abilities and increase the risk of accidents.