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Immune System

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment explaining how our bodies' immune systems work.

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I can't believe that Jacob actually kicked you out of the treehouse. 00:00:00
He may be healthy, but he has cabin fever really bad. 00:00:03
I'm just glad Dr. Ziliacs agreed to meet with us at our office. 00:00:06
Hi, you must be Dr. Ziliacs. We're the treehouse detectives. 00:00:12
Hello. Glad you could come. I hear you need to learn more about the immune system. 00:00:15
Yes. We're trying to figure out how to help Jacob stay well. 00:00:19
What exactly is the immune system? 00:00:23
The immune system is a body-wide coordinated group of cells that help protect you against serious infection. 00:00:25
These cells act like an army to help defend us against attack from dangerous germ invaders. 00:00:31
Where are these cells located? 00:00:36
Well, with most body systems, there's a large part that you can point to, like your brain or your heart or your lungs. 00:00:38
But with the immune system, it's not found in just one place. 00:00:44
These cells travel throughout your body. 00:00:47
So how does the immune system work? 00:00:49
Well, the immune system's made up of lots of different small cells. 00:00:51
These cells have some funny names, like neutrophils, eosinophils, and lymphocytes. 00:00:55
Those are funny names. What do they mean? 00:01:00
Well, those are actually Greek and Latin names that describe what these cells look like under the microscope. 00:01:02
Why does your body have more than one kind of cell to fight off infection? 00:01:07
Well, just like an army has different kinds of soldiers, each of these cells has their own special job. 00:01:11
They cruise around quietly through your bloodstream, waiting to get a call into action. 00:01:17
When an infection occurs, they swarm in at the site of the infection, ready to defend you against the germ. 00:01:22
The cells sound like they are really important in helping our body fight off infections and diseases. 00:01:28
Is there any way that you could strengthen your immune system to make it work better? 00:01:33
There are things you can do to keep your immune system strong and healthy. 00:01:37
You need to certainly eat right and get plenty of sleep and exercise. 00:01:40
Is there anything else you can do? 00:01:43
Well, there is another trick to keep your immune system smart and strong, 00:01:45
and that's to get all the immunizations that the doctors give you when you're young. 00:01:48
What is an immunization? 00:01:52
Well, immunizations are also called vaccines. 00:01:54
They're either weakened forms of the germ or germ parts that help protect us against dangerous infectious diseases. 00:01:56
How do they work? 00:02:02
Well, when a vaccine enters the body, it shows your immune system important parts of the germ, 00:02:04
and that allows your immune system to create specialized proteins called antibodies. 00:02:08
If the vaccine puts germs in our bodies, why don't we get sick? 00:02:13
Well, it's just enough germ exposure to help us build antibodies, not enough to actually have you get sick. 00:02:17
Then later, when that germ tries to enter your body, 00:02:23
there's lots of good stockpiled antibodies available to fend off infection from that particular germ. 00:02:26
Can you get immunized for all illnesses? 00:02:31
Well, no, not every infection can be prevented in this way. 00:02:34
First, scientists have to learn an awful lot about the germ and exactly how it's built 00:02:37
to be able to make a vaccine that coaxes your immune system into making the right antibodies. 00:02:41
I wish they had a vaccine for the common cold. 00:02:46
Well, I do too, but with a cold, it's just you and your immune system battling it out against the cold germ. 00:02:49
So for now, to avoid colds, it's best to do everything you can to keep your immune system as healthy as possible. 00:02:54
That's right. You need to rest, eat right, and sleep. 00:03:01
I think Jacob needs to rethink his quarantine idea. 00:03:05
Thanks, Dr. Ziliacs. You've been a lot of help. 00:03:08
You're welcome. Call if you have any other questions. 00:03:11
Bye. 00:03:13
Bye. 00:03:14
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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:
489
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 16″
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:
19.72 MBytes

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