Практика Shadowing: Feedback Mechanisms - Your body’s control Systems - Physiology - Изучайте разговорный английский по видео
Создание урока...
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What's up nerds?
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How are you today?
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Today's topic is control systems of your body, the amazing physiology, how your body stays alive.
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So, let's get started.
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But first, let's get this example.
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You have your thyroid gland taking orders from the pituitary gland to secrete thyroid hormone in the bloodstream.
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If there is an excess amount of thyroid hormone in the bloodstream, it will produce something we call negative feedback.
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It will tell the thyroid, stop what you're doing, we already have enough.
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And it will tell the pituitary, this is your pituitary, not your testicles,
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please stop producing TSH to stimulate this thyroid hormone production, we already have enough.
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Your body has thousands of control systems.
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Your body is a control freak.
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They keep your body alive.
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A significant change in your internal environment, also known as the extracellular fluid, can lead to your death.
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Life needs balance.
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Life is only possible within a narrow range.
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For instance, your body temperature at change of greater than 7 degrees Celsius
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or 11 degrees Fahrenheit can literally put you to death.
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If you don't get it, let's get an example.
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Regulation of oxygen and carbon dioxide in the extracellular fluid.
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Here is your blood vessel.
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It has red blood cells and they have hemoglobin.
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Hemoglobin carries oxygen.
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Oxygen is given to the tissue, but when the oxygen in the tissue is very abundant, they will tell the hemoglobin, thank you, we have enough oxygen.
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So the oxygen stops flowing from hemoglobin to the cell because hemoglobin has a high affinity to oxygen.
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It really loves oxygen too much.
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But on the other hand, if you have lots of carbon dioxide in the tissue, the cells will handle them to the hemoglobin.
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Please take care of this carbon dioxide
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and it will carry it to the lungs your lungs will exhale the carbon dioxide out.
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Okay, when the CO2 is like abundant in your blood, the brainstem is stimulated.
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So, you will breathe rapidly and deeply to get rid of this CO2.
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Very cool.
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By the way, this is called oxygen buffering function of hemoglobin, which is indeed astonishing.
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Now, let's turn our attention to the story of your blood pressure regulation.
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Let's suppose that you are having increased of your blood pressure.
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This will stretch your arteries.
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In your arterial walls, especially the aortic arch and the bifurcation of the carotid artery, you have some stuff called baroreceptors.
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So, receptors are easy to understand.
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Okay, what about baro?
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You remember in physics the barometer, okay, pressure meter.
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So baro means pressure.
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They sense pressure.
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So when you stretch these arteries, they will sense this pressure.
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They will give nerve impulses to the medulla of your brainstem.
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This nerve impulses or this vasomotor center will respond by dilating your blood vessels and decreasing the pumping activity of your heart,
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which will lead to decrease your blood pressure and back to normal.
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Very well done.
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On the other hand, if you have low blood pressure, stretches of the arterial wall will decrease, which will lead to less stimulation of baroreceptors,
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loss of inhibition of the vasomotor center, loss of inhibition equals kind of stimulation.
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So will lead to constriction of your blood vessels and increase pumping activity of your heart.
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They will raise your blood pressure and back to normal.
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Amazing!
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To get an idea about the tight regulation, take calcium for example.
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Very low calcium and you get titanic convulgence.
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Very high calcium and your heart will stop.
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Potassium, very high potassium your heart suffers.
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Very low potassium can lead to muscle problems or heart problems.
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Glucose, low glucose seizure.
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high glucose you can end up in coma such as in hyperosmolar non-ketotic coma and stuff like that also diabetic ketoacidosis.
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The concept of negative feedback is truly amazing.
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So high carbon dioxide you will breathe rapidly and deeply in response.
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This is called hyperventilation.
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This will lead to exhaling CO2 and reducing its amount back to normal.
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Why is this negative feedback?
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Because the result is opposite to the initiating stimulus.
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This is called negative.
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The increased CO2 started the events that will lead to its reduction.
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This is called negative feedback.
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On the other hand, low CO2, you will breathe slowly, called hypoventilation, to make the CO2 build up.
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This is also negative feedback.
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Hey, but wait, this CO2 is increasing.
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Yes, still negative because the result is opposite to the initiating stimulus.
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So we call this negative feedback.
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Negative feedback is cool, but positive feedback sometimes can lead to death.
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Oh, really?
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Yes.
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Normally you have five liters being pumped by your blood in every minute.
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Let's say that you are an idiot texting while crossing the street
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and you got hit by a car and you bled 2 liters of blood.
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Your heart will pump 3 liters instead of 5 per minute, which will lead to less blood going to the coronary arteries which feed the heart itself.
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This will lead to decreased pumping activity of the heart the
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heart pumps less blood less blood goes to the coronaries
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and you are in a vicious cycle until you die okay stop texting
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while crossing the street but on the other hand
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if you let only one liter okay negative feedback will happen yes your heart will pump less blood
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but this negative feedback will kick in to override the positive feedback
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and you can live so positive feedback in the first example can lead to death.
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So you're saying that positive feedback is always bad?
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No, no, no, no. It can be beneficial.
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For instance, when you bleed, activation of the clotting cascade will lead to activation of other enzymes in the adjacent vessels.
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They activate the cascade, activate the cascade of other tissues, activate the cascade, and you stop bleeding.
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Also, and uterine contractions during child labor.
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The mommy pushes the baby.
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Okay.
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These are called uterine contractions.
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They push the baby to the cervix.
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Stretch of the cervix will lead to more contractions.
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More contractions, more pushing, more contractions, more pushing, more dilation of the cervix, more contractions, and so forth.
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This is called a positive feedback, and it has a very beneficial result.
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The baby is born.
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Woo-hoo!
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That's it for today.
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In the next video, we'll talk about the human cell.
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So don't forget to subscribe and follow me on Facebook.
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I have 101 questions on Facebook until the end of this year.
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Also, Twitter, SoundCloud, Instagram.
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And don't forget to support me on Patreon.
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And thank you so much for watching.
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This is me, the Coast Perfectionelis.
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Be safe, stay happy, and study hard.
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Лексика и советы по произношению к этому уроку
Этот урок разговорной практики уровня C1 построен на видео «Feedback Mechanisms - Your body’s control Systems - Physiology». Чаще всего повторяются слова: blood, feedback, lead, negative, oxygen. В этом видео 110 предложений и 1108 слов для шедоуинга. Речь длится 8:09. Говорящий держит ровный темп — около 136 слов в минуту, удобный для шедоуинга. Только 78% слов входят в 3000 самых частых слов английского языка, поэтому лексика сложная.
Ключевая лексика этого видео
Самые сложные слова из видео (15), с произношением и значением:
| Слово | Произношение | Значение |
|---|---|---|
| hemoglobin существительное | /ˌhimoʊˈɡloʊbɪn/ | гемоглоби́н |
| contraction существительное | /kənˈtɹækʃ(ə)n/ | сокраще́ние, сжа́тие |
| thyroid прилагательное | /ˈθaɪ.ɹɔɪd/ | щитови́дный |
| dioxide существительное | /daɪˈɑksaɪd/ | диокси́д, двуо́кись |
| cascade существительное | /kæsˈkeɪd/ | водопа́д |
| artery существительное | /ˈɑɹ.təɹ.i/ | арте́рия |
| cervix существительное | /ˈsɝ.vɪks/ | ше́йка ма́тки |
| potassium существительное | /pəˈtæsiəm/ | ка́лий |
| bleed глагол | /ˈbliːd/ | пусти́ть кровь, пуска́ть кровь |
| glucose существительное | /ˈɡluː.kəʊz/ | глюко́за |
| activate глагол | /ˈæktɪˌveɪt/ | активизи́ровать, активи́ровать |
| hormone существительное | /ˈhoɹmoʊn/ | гормо́н, инкре́т |
| calcium существительное | /ˈkælsi.əm/ | ка́льций |
| arterial прилагательное | артериа́льный | |
| bloodstream существительное | /ˈblʌd.stɹɪim/ | кровото́к |
Фразовые глаголы, которые вы услышите
| Слово | Значение |
|---|---|
| build up глагол | накапливаться, скапливаться |
Фразы, которые стоит повторять
Короткие законченные фразы из видео, которые пригодятся в повседневном разговоре:
- How are you today?
- If you don't get it, let's get an example.
- So you're saying that positive feedback is always bad?
Грамматика в этом видео
Конструкции, которые говорящий использует чаще всего, с точными словами из видео:
| Конструкция | В видео |
|---|---|
| Пассивный залог be + причастие прошедшего времени — важно, что происходит, а не кто это делает | is given · is stimulated · is called |
| Придаточные определительные who / which + предложение — уточнение о человеке или предмете | hemoglobin, which is · decrease, which will · minute, which will |
Произношение, на которое стоит обратить внимание
Говорящий использует 6 сокращённых и редуцированных форм, например don't, you're, we'll. Произносите их коротко, так, как слышите.
- Звуки «sh» и «zh»: contraction /kənˈtɹækʃ(ə)n/, inhibition /ɪnhɪˈbɪʃən/, stimulation /stɪm.jʊˈleɪ.ʃən/, initiate /ɪˈnɪʃ.i.eɪt/, activation /ˌæktəˈveɪʃən/
- Длинные слова — следите за ударением: hemoglobin /ˌhimoʊˈɡloʊbɪn/, pituitary /pɪˈtuɪˌtɛɹi/, coronary /ˈkɔɹənɛɹi/, inhibition /ɪnhɪˈbɪʃən/, stimulation /stɪm.jʊˈleɪ.ʃən/
Звуки, трудные для русскоязычных:
- /h/ — лёгкий выдох, а не русское «х»: hemoglobin /ˌhimoʊˈɡloʊbɪn/, hormone /ˈhoɹmoʊn/, exhale /ˌɛksˈheɪ̯l/, inhibition /ɪnhɪˈbɪʃən/, hyperventilation /ˌhaɪpɚˌvɛntəˈleɪʃən/
- Звонкие согласные в конце слова — не оглушайте их: thyroid /ˈθaɪ.ɹɔɪd/, dioxide /daɪˈɑksaɪd/, cascade /kæsˈkeɪd/, bleed /ˈbliːd/, glucose /ˈɡluː.kəʊz/
Как заниматься с этим видео
- Прослушайте всё видео один раз молча и выпишите незнакомые слова.
- Повторяйте предложение за предложением на обычной скорости, пока ваш ритм не совпадёт с ритмом говорящего.
- Запишите себя и сравните с оригиналом, обращая внимание на такие слова, как hemoglobin, contraction, thyroid.
Что такое техника Shadowing?
Shadowing — это научно обоснованная техника изучения языка, изначально разработанная для подготовки профессиональных переводчиков и популяризированная полиглотом доктором Александром Аргуэльесом. Метод прост, но эффективен: вы слушаете аудио на английском от носителей языка и немедленно повторяете вслух — как тень, следующая за говорящим с задержкой в 1–2 секунды. В отличие от пассивного прослушивания или грамматических упражнений, Shadowing заставляет мозг и мышцы рта одновременно обрабатывать и воспроизводить реальные речевые паттерны. Исследования показывают, что это значительно улучшает точность произношения, интонацию, ритм, связную речь, понимание на слух и беглость речи — что делает его одним из самых эффективных методов для подготовки к IELTS Speaking и реального общения на английском.