Shadowing Practice: Innate Immune System: Simple Overview (Classification, General Factors) - Immunology - Learn English Speaking with Video
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Hello and welcome to another video.
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This video is mainly going to be about the innate immune system.
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Now, your immune system uses two main strategies to defeat any type of unwanted invaders.
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One of the strategies is called the innate immune system and the other one is called the acquired immune system.
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The innate immune system is mainly present since birth and is therefore sometimes also called the natural immune system.
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While the acquired, however, forms during a person's lifetime and is therefore sometimes also called the adaptive.
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Now just remember that the baby also has some type of acquired immune system.
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I just put the baby there to show you that you've always had the innate immune system ever since you were born.
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So now let's put this to practice.
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Imagine we have three different types of bacteria, right?
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The innate immune system is what we call non-specific because it actually works against any type of agents equally.
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The adaptive however works very specific as you see right here.
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And not only that, upon defeating the bacteria, you gain some kind of immunological memory,
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which usually becomes enhanced upon repeated exposure to the same agents.
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The innate immunity doesn't really have that.
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And so let's see how that works.
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We mainly classify the innate immune system into three different types.
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The first is what we call general factors.
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And we've got the cellular factors and also factors and humoral factors.
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The general factors include physiological barriers at the portal of entry like the skin and mucous membranes.
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And they're usually, analogically enough, the first line of defense.
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Next we have the pyrogenic reactions.
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Now don't get scared if you haven't heard this term before.
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I'll get more into this later when I talk about the macrophages mainly.
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pyrogenic reactions often referred to as fever.
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Some viruses and bacterias cannot really replicate optimally because the body changes its temperature.
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So that's why we called it the general factors because it works generally by increasing the temperature.
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Another general factors are secretion.
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You know, secretion of different enzymes, fatty acids.
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The cellular Some of the factors are your own microbiota fighting for space in food.
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Phagocytosis by cells like neutrophils and macrophages.
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They do that by the different receptors they have on the surface.
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We also got natural killer cells.
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They're really important for the antiviral immune response.
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These cells can bind to the surface of antigens by using toll-like receptors, which usually lead to inflammatory response.
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Humeral factors which include the complement system and the interference.
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Now I know this seems a lot but trust me it all gets logical once you understand the concepts.
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In my opinion
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if you want to learn immunology properly you need to understand
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the different parts individually before you can understand the whole concept together in a system.
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And that's what I'm aiming to show you, everything individually first and then put them all together and show you how this works in a system system.
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Alright, so in this video I'm mainly going to focus on the general factors
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because those are really important factors to start with when you want to understand immunology.
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Now imagine these are your epithelial cells.
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Let's say this is your skin for example.
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The first one includes physical barrier where bacteria cannot really enter because of the tight junctions these cells really have.
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Another mechanism is when the bacteria can't enter because of secreted products,
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could be free fatty acids released by your gastrointestinal tract or enzymes released at the mucous membrane.
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So let's do it like that.
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In the saliva, sweat glands and tears we have something called lysozyme
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which once secreted out they break down the peptidoglycan layer of the bacterial cell wall.
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Next you know the gastrointestinal tract?
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You got some cells in the walls of your stomach called parietal and chief cells.
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Chief cells can release pepsin which breaks down the proteins of certain bacteria.
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And parietal cells mainly release hydrochloric acid for lowering the pH.
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We can also have defensins in the gastrointestinal tract.
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The list goes on and on.
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The point is that we secrete out quite a lot of substances as a part of our general innate immunity.
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Some bacteria can actually get through all of this mess without even getting hurt, and those are the bacteria that usually make us sick.
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Alright, so what else do we have?
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You know the normal microbiota you have in your body?
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They actually protect you by making a hard environment for the foreign bacteria to grow in, by taking up space in food for example.
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So that's mainly the general factors I wanted to talk about.
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Now from the cellular factors, we've already talked about the microbiota, limiting the pathogenic bacteria from growing.
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In my next video we will look at what toleric receptors are and how phagocytosis happens in details and steps in inflammation.
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Natural killer cells has a cytotoxic mechanism
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and I feel like it's more logical to talk about it later
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when I talk about the cellular immune response as it kind of fits more there.
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Alright, so let's look at these.
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Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel C1 se basa en el vídeo “Innate Immune System: Simple Overview (Classification, General Factors) - Immunology”. Las palabras que más se repiten: factors, immune, cell, bacteria, innate. Este vídeo tiene 69 frases y 865 palabras para practicar shadowing. La parte hablada dura 5:09. El hablante habla a un ritmo natural de unas 168 palabras por minuto, cercano a una conversación cotidiana. Solo el 80 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.
Vocabulario clave de este vídeo
Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| bacterium sustantivo | /bækˈtɪəɹ.ɪəm/ | bacteria |
| innate adjetivo | /ɪˈneɪt/ | innato, nato |
| cellular adjetivo | /ˈsɛl.ju.lə/ | celular |
| gastrointestinal adjetivo | /ˌɡæstɹoʊɪnˈtɛstɪnəl/ | gastrointestinal |
| tract sustantivo | /tɹækt/ | extensión |
| receptor sustantivo | /ɹɪˈsɛp.tə/ | receptor |
| immunology sustantivo | inmunología | |
| macrophage sustantivo | /ˈmækɹɔʊː.feɪd͡ʒ/ | macrófago |
| mucous adjetivo | /ˈmjuːkəs/ | mocoso, pituitoso |
| phagocytosis sustantivo | /ˌfeɪ.ɡoʊ.saɪˈtoʊ.sɪs/ | fagocitosis |
| secretion sustantivo | /sɪˈkriːʃ(ə)n/ | secreción |
| adaptive adjetivo | /əˈdæp.tɪv/ | adaptativo |
| enzyme sustantivo | /ˈɛn.zaɪm/ | enzima |
| individually adverbio | /ˌɪndɪˈvɪd͡ʒ(u)əli/ | individualmente |
| immunity sustantivo | /ɪˈmjuːnəti/ | inmunidad |
Phrasal verbs que vas a escuchar
| Palabra | Pronunciación | Significado |
|---|---|---|
| break down verbo | descomponerse, averiarse | |
| get through verbo | /ɡɛt ˈθɹu/ | aguantar, salir adelante |
Frases que vale la pena repetir
Frases cortas y completas del vídeo que puedes reutilizar en la conversación diaria:
- Let's say this is your skin for example.
- Next you know the gastrointestinal tract?
- Alright, so what else do we have?
- You know the normal microbiota you have in your body?
- Alright, so let's look at these.
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Present perfect have/has + participio pasado — una acción pasada que sigue importando ahora | haven't heard · we've already talked |
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | is called · were born |
Pronunciación a tener en cuenta
El hablante usa 12 contracciones y formas reducidas, como I'm, they're, we've. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “sh” y “zh”: secretion /sɪˈkriːʃ(ə)n/, inflammation /ɪnfləˈmeɪ̯ʃən/, junction /ˈd͡ʒʌŋkʃən/
- Palabras largas — cuida el acento: gastrointestinal /ˌɡæstɹoʊɪnˈtɛstɪnəl/, parietal /pəˈɹaɪ.ə.təl/, phagocytosis /ˌfeɪ.ɡoʊ.saɪˈtoʊ.sɪs/, individually /ˌɪndɪˈvɪd͡ʒ(u)əli/, immunity /ɪˈmjuːnəti/
Sonidos difíciles para hispanohablantes:
- /v/ — no es /b/: los dientes tocan el labio inferior: adaptive /əˈdæp.tɪv/, individually /ˌɪndɪˈvɪd͡ʒ(u)əli/, antiviral /æntiˈvaɪɹəl/, invader /ɪnˈveɪ.də(ɹ)/, saliva /səˈlaɪvə/
- /z/ — sonora, no /s/: enzyme /ˈɛn.zaɪm/, lysozyme /ˈlaɪsəzaɪm/, physiological /ˌfɪz.i.əˈlɑ.d͡ʒɪ.kəl/
- /dʒ/ — no es la “y” ni la “ch”: macrophage /ˈmækɹɔʊː.feɪd͡ʒ/, individually /ˌɪndɪˈvɪd͡ʒ(u)əli/, analogically /ˌænəˈlɒd͡ʒɪkli/, pathogenic /pæθəˈd͡ʒɛnɪk/, physiological /ˌfɪz.i.əˈlɑ.d͡ʒɪ.kəl/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como bacterium, innate, cellular.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.