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Bodily Protective Functions

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment describing how our bodily protective materials and functions work.

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Dr. D said that he would meet us here. He's been to some pretty weird places, but this 00:00:00
really takes the cake. Look at that nose. Gross. Dr. D? 00:00:14
Yes? Katherine and I just talked to Dr. Zilliax. 00:00:22
She told us that the body has a number of ways of protecting itself from infection, 00:00:28
but we need to know some other ways the body defends itself. 00:00:31
Well, you're in the right place. This grossology exhibit here at the Virginia Marine Science 00:00:34
Museum is a perfect spot to investigate some of the gross ways the body protects itself, 00:00:38
like snot and vomit. What does vomit have to do with protecting 00:00:43
your body? I think I know. If you eat something that might 00:00:51
harm the body, then the body gets rid of it as fast as possible. 00:00:54
Very good. Poisons, bacteria, and viruses can upset the stomach and cause an uptuck. 00:00:57
Well, here's some vomit right here. You're kidding. 00:01:02
Well, it's just fake vomit. In fact, it's edible. 00:01:06
Gross. Kids, don't try this at home. 00:01:15
Real vomit is a combination of food, stomach acid, mucus, and other stuff. Let's talk about 00:01:20
mucus. You mean what we call snot? 00:01:26
That's right. Mucus is a slimy liquid that traps microbes, along with dust and other 00:01:29
foreign particles. I read on a website that body fluids like 00:01:34
mucus, saliva, and tears contain enzymes that kill bacteria. 00:01:38
That's right. These fluids are found in the nose, eyes, and mouth, which are the easiest 00:01:42
places for microbes to enter the body. Do you know that you swallow about a quart 00:01:46
of snot every day? Did you have to tell us that? 00:01:50
Sometimes mucus, or snot, traps invading microbes like bacteria, viruses, and fungus 00:01:55
spores. Little hairs called cilia then push the snot 00:02:00
toward the back of the nose and into the throat, where you swallow it. 00:02:03
What ends up in the stomach, stomach acid, kills a lot of the dangerous microbes. 00:02:07
We have acid in our stomach? Yes, we do. Hydrochloric acid. It's not only 00:02:11
deadly to certain microbes, it also aids in digestion. 00:02:16
It's pretty strong stuff. Watch as this acid dissolves this piece of 00:02:19
zinc. So why doesn't our stomach get dissolved? 00:02:23
The stomach also creates that magic stuff called mucus. 00:02:42
This ton of mucus is a protective coating for the stomach. 00:02:46
There's some mucus right here. Please tell me that's fake mucus. 00:02:53
Okay, I admit it is. It's made of corn syrup and gelatin, but it 00:02:59
has a lot of the same characteristics and ingredients of real mucus. 00:03:03
I hate to ask, but what are some other ways the body defends itself? 00:03:07
Something as simple as a sneeze can expel infected mucus from the nose at a speed of 00:03:12
up to 100 miles an hour. Wow, that's fast. I guess a cough does the 00:03:16
same thing. Yes, it does, but a cough is expelling particles 00:03:20
of micro-blade mucus out of the throat and lungs. 00:03:24
We learned at the Centers for Disease Control that coughing is also a way to spread diseases. 00:03:27
One more example. What do you know about sweat? 00:03:32
We learned in school that it helps to cool the body when you get overheated. 00:03:35
Very good. Did you also know that it provides food for bacteria and fungi that live on the 00:03:39
surface of the skin? I don't want bacteria living on my skin. 00:03:43
Mr. Frank told us about good bacteria. Is that what you're talking about? 00:03:48
Indeed. This good bacteria munches on sweat and oil on the skin and produces acidic waste 00:03:52
products. These acids make it difficult for invading harmful bacteria to survive on the 00:03:57
skin. So bacteria is part of the immune system. 00:04:02
Yes, it acts as a barrier to harmful bacteria. It's a good thing the body has lots of ways 00:04:05
of defending itself. I think we have a new hypothesis. If Jacob 00:04:10
stays away from people who are sick and strengthens his immune system with rest, good nutrition 00:04:14
and exercise, then I'll stay healthy. Thanks, Dr. D. 00:04:19
You're welcome. Enjoy the exhibit. 00:04:22
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
469
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
04′ 26″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
26.66 MBytes

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