Alcohol

Alcohol

 

  • Typically ingested through the digestive tract; maximum blood concentrations are reached within 30 minutes to 1.5 hours.

    • Rate of absorption depends on stomach content;

      • food slows absorption by mixing with alcohol and delaying its passage through the stomach.

  • Alcohol readily crosses the blood-brain barrier due to its solubility in both lipids and water.

  • The liver clears alcohol at a steady rate, unaffected by the amount consumed.

 

  • Initial taste is often unappealing, but the effects become desirable, leading to increased consumption.

    • Higher doses result in impaired reflexes, motor coordination, and memory loss.

  • Regular memory loss from drinking should prompt reevaluation of drinking habits.

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  • Alcohol causes dilation of blood vessels, leading to a sensation of warmth but also increasing heat loss.

    • Danger of hypothermia in cold environments due to vasodilation; never leave intoxicated individuals alone without proper clothing.

  • Alcohol is a diuretic, increasing fluid removal from the body.

    • It is a "dirty molecule" that interacts with many systems due to its small size.

 

 

Effects of Alcohol

  • GABA-A Receptor Agonist:

    • Enhances the effects of GABA, an inhibitory neurotransmitter.

    • Increases inhibition in the nervous system, impairing prefrontal cortex control and promoting sleepiness.

  • NMDA Receptor Antagonist:

    • Blocks NMDA receptors, a type of glutamate receptor, which impairs memory formation in the hippocampus.

    • High alcohol concentrations can prevent the creation of new long-term memories.

 

 

Long-Term Effects and dangers of Alcohol

  • Liver failure due to repeated alcohol use.

  • Brain damage, including Korsakoff's syndrome, which impairs the ability to form new memories permanently.

  • Fetal alcohol syndrome in babies born to mothers who drank alcohol during pregnancy.

 

Pregnancy Advice:

  • Varies by country; the U.S. advises complete abstinence, while the UK suggests a limited amount is acceptable.

  • Abstaining is the most conservative approach.

  • Alcohol is addictive, leading to physical dependence.

 

Hangovers

  • combination of dehydration (due to alcohol's diuretic effect) and withdrawal symptoms.

    • Hangover "remedies" involving more alcohol consumption address withdrawal symptoms but are unhealthy.

    • Severe alcohol withdrawal can cause lethal delirium tremens, characterized by seizures due to a lack of inhibition in the brain.

 

  • Alcohol increases dopamine release in the nucleus accumbens, suggesting psychological addiction.

    • There is a strong heritable component to alcohol addiction, with genetic variations affecting receptor types and sensitivity to addiction.

    • Driving under the influence of alcohol is extremely dangerous due to impaired coordination, reflexes, and judgment.