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Best Answer: Alcohol or ethanol affects the human nervous system by inhibiting signals between the brain, nerve endings and spinal cord. When people drink, their bloodstream absorbs the alcohol and nervous system functions slow down dramatically--this is the buzz or numbness people commonly feel after drinking.
How does alcohol affect my heart? There is a very clear link between regularly drinking too much alcohol and having high blood pressure. Over time, high blood pressure (hypertension) puts strain on the heart muscle and can lead to cardiovascular disease (CVD), which increases your risk of heart attack and stroke.