シャドーイング練習: How does alcohol make you drunk? - Judy Grisel - YouTubeで英語スピーキングを学ぶ
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Ethanol.
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Ethanol.
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This molecule, made of little more than a few carbon atoms,
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is responsible for drunkenness.
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Often simply referred to as alcohol,
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ethanol is the active ingredient in alcoholic beverages.
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Its simplicity helps it sneak across membranes and nestle into many different nooks,
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producing a wide range of effects compared to other, clunkier molecules.
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So how exactly does it cause drunkenness?
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And why does it have dramatically different effects on different people?
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To answer these questions, we'll need to follow alcohol on its journey through the body.
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Alcohol lands in the stomach and is absorbed into the blood through the digestive tract,
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especially the small intestine.
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The contents of the stomach impact alcohol's ability to get into the blood,
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because after eating, the pyloric sphincter,
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which separates the stomach from the small intestine, closes.
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So the level of alcohol
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that reaches the blood after a big meal might only be a quarter that from the same drink on an empty stomach.
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From the blood, alcohol goes to the organs,
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especially those that get the most blood flow,
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the liver and the brain.
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It hits the liver first,
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and enzymes in the liver break down the alcohol molecule in two steps.
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First, an enzyme called ADH turns alcohol into acetaldehyde, which is toxic.
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Then, an enzyme called ALDH converts the toxic acetaldehyde to non-toxic acetate.
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As the blood circulates, the liver eliminates alcohol continuously.
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But this first path of elimination determines how much alcohol reaches the brain and other organs.
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Brain sensitivity is responsible for the emotional,
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cognitive and behavioral effects of alcohol, otherwise known as drunkenness.
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Alcohol turns up the brain's primary brake,
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the neurotransmitter GABA, and turns down its primary gas, the neurotransmitter glutamate.
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This makes neurons much less communicative,
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and users feel relaxed at moderate doses,
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fall asleep at higher doses,
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and can impede the brain activity necessary for survival at toxic doses.
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Alcohol also stimulates a small group of neurons that extends from the midbrain to the nucleus accumbens,
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a region important for motivation.
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Like all addictive drugs, it prompts a squirt of dopamine in the nucleus accumbens,
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which gives users a surge of pleasure.
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Alcohol also causes some neurons to synthesize and release endorphins.
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Endorphins help us to calm down in response to stress or danger.
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Elevated levels of endorphins contribute to the euphoria and relaxation...
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...associated with alcohol consumption.
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Finally, as the liver's breakdown of alcohol outpaces the brain's absorption...
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...drunkenness fades away.
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Individual differences at any point in this journey...
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...can cause people to act more or less drunk.
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For example, a man and a woman who weigh the same and drink the same amount during an identical meal
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will still have different blood alcohol concentrations, or BACs.
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This is because women tend to have less blood.
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Women generally have a higher percentage of fat,
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which requires less blood than muscle.
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A smaller blood volume carrying the same amount of alcohol means the concentration will be higher for women.
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Genetic differences in the liver's alcohol-processing enzymes also influence BAC,
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and regular drinking can increase production of these enzymes, contributing to tolerance.
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On the other hand, those who drink excessively for a long time may develop liver damage,
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which has the opposite effect.
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Meanwhile, genetic differences in dopamine,
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GABA, and endorphin transmission may contribute to risk for developing an alcohol use disorder.
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Those with naturally low endorphin or dopamine levels may self-medicate through drinking.
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Some people have a higher risk for excessive drinking due to a sensitive endorphin response that increases the pleasurable effects of alcohol.
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Others have a variation in GABA transmission that makes them especially sensitive to the sedative effects of alcohol,
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which decreases their risk of developing disordered drinking.
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Meanwhile, the brain adapts to chronic alcohol consumption by reducing GABA,
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dopamine and endorphin transmission transmission and enhancing glutamate activity.
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This means regular drinkers tend to be anxious,
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have trouble sleeping and experience less pleasure.
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These structural and functional changes can lead to disordered use when drinking feels normal but not drinking is uncomfortable,
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establishing a vicious cycle.
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So both genetics and previous experience impact how a person experiences alcohol,
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which means that some people are more prone to certain patterns of drinking than others,
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and a history of consumption leads to neural and behavioral changes.
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Similar to alcohol, how someone experiences marijuana depends on a number of factors,
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including, for example, genetics.
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Find out more about the effects and risks of marijuana use with this video.
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このビデオで話す練習をする理由
「アルコールがどのように酔っ払わせるのか？」というテーマは、英語を学ぶ上で非常に興味深く、実用的な内容です。このビデオを使って、英語シャドーイングを行うことで、さまざまな感情や思考を表現するための語彙とフレーズを身につけることができます。具体的な科学的説明が含まれているため、英語での話し方の流暢さや説得力を向上させる助けになります。また、話し方のリズム、イントネーション、自然な会話の流れを学ぶのにも理想的です。特に、IELTS スピーキング対策としても有効です。
文法と文脈における表現
- “alcohol is absorbed into the blood” — このフレーズは、物事が進行する過程や結果を示すのに役立ちます。英語では、受動態を使うことで、事実を強調することができます。
- “the level of alcohol that reaches the blood” — 「reach」の使い方は、物事の到達を表す基本的な表現です。会話の中で状況を説明する際に便利です。
- “This makes neurons much less communicative” —「make」や「less」を使うことで、原因と結果の関係を示すことができます。この表現方法を覚えておくと、複雑なアイデアをシンプルに伝えやすくなります。
- “Alcohol also stimulates a small group of neurons” — 動詞「stimulate」を使って能動的な意味を持たせると、より強調された表現になります。話し手が聞き手にインパクトを与えるために効果的です。
一般的な発音のワナ
このビデオでは、いくつかの難しい発音があるため、英語を学ぶ際に注意が必要です。特に「ethanol」「acetaldehyde」「neurotransmitter」などの専門用語は、英語シャドーイングの際に発音が難しいかもしれません。また、発音の際のアクセントにも気をつける必要があります。shadow speakとして知られる練習は、これらのトリッキーな単語を正しく発音するために効果的です。特に、YouTubeで英語学習を行う際、正しいイントネーションとリズムを意識することで、リスニングとスピーキング能力を向上させることができます。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。