3ESO How the body defends itself - Contenido educativo
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There are a lot of things that can harm us.
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There are many organisms around our world that can come inside our body and kill us.
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Why do not die straight ahead after we are born?
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Because we have ways of defending ourselves. Let's go into study them.
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There could be some artificial way to defend ourselves, like the science of medications,
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but our body has its own defensive system. Let's see it.
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Number two, how the body defends itself.
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We have studied many different systems and organs in our body.
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We have studied the digestive system, respiratory system, nervous system, endocrine system, respiratory system.
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Now we're going to study another one related with the defense of our body, immune system.
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Get ready to copy the definition.
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Immune system, set of defense mechanisms that provide human body with resistance to infections caused by pathogens
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There are two ways that the immune system has to defend ourselves
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The first one we are going to study is the innate immunity
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This innate immunity is the immunity that we have from birth
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before we are born and when we are given birth we develop this innate immunity in this innate
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immunity there are external defenses that we have already studied most of them we started with our
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skin we said that our skin was the outer part of our body that was the first way of defending
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our body. We have a way, the different layers of skin, which are going to be a barrier against
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external microorganisms. We have also mucous membrane. When we talk, for example, about the
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trachea, we say that it has some mucous surrounding it and that prevents the infection from getting
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inside our body bodily secretion tears mucus those secretions are going to help when it comes to
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a way to get inside our body we for example we get some dust inside our eye we're going to cry
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and these tears are going to get the things out of the eye and natural bacterial flora for example
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we say that inside the large intestine we have some bacteria that were very important for the
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digestion and to help us with making the feces and with the defense of that part of our body
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but also on our skin there are millions trillions of bacteria that are going to help to maintain it
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healthily do you know for example that when we are born we get the bacteria from our mothers
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when we have a natural birth not a cesarean natural birth we get the bacteria from the vagina
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and those bacteria from our mother are going to get inside our body and they are going to be the
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first bacteria that are going to colonize us and they are going to help with the defense of the
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the body also with the breastfeeding the babies are going to get these bacteria healthy and are
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going to have less infections there are also some cells which their duty is to eat rubbish basically
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which are called the phagocytes in spanish we call it macrophagos and they are white blood
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cells that are going to take all the different bacteria all the different viruses that are
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inside our body, cells which are, for example, dangerous cells because they are cancerous cells
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or tumoral cells, and they are going to take them out of the body. So, what are the phagocytes?
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Copy definition, white blood cells that capture pathogens by means of pseudopedia and digestion.
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One important reaction in this innate immunity is the inflammatory reaction.
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Why? Imagine that we get a cut and we start bleeding.
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All the different processes that are taking place on our skin are part of the inflammatory response.
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You have a drawing in the aula virtual which you have to make here.
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underneath this information, no you cannot print it and just glue it, no you can copy it but do not
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print it and write all the information related to the inflammatory response here. The acquired
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immunity comparing with innate immunity is an immunity that we get throughout our life and it's
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very very specific to the microorganism that is going to infect us this specific reaction is
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taking place by the lymphocytes lymphocytes are also white blood cells but these white cells are
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very very specific to the virus or the bacteria that is inside to our body and they develop the
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humoral immune response that to understand this humoral immune response you are going to
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make a couple of drawings that appear in the aula virtual remember do not print it okay just
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you can copy it but do not print and glue so make the drawings underneath here
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and we'll explain it later in class this is how the body defends itself as you can see there are
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very different elements involved in this situation remember to make good drawings with all the
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the different information there with different colors and see you next day
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- Idioma/s:
- Autor/es:
- Marta García Pérez
- Subido por:
- Marta G.
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 103
- Fecha:
- 16 de marzo de 2021 - 13:22
- Visibilidad:
- Clave
- Centro:
- IES FORTUNY
- Duración:
- 06′ 31″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1920x1080 píxeles
- Tamaño:
- 519.58 MBytes
