Cell vs. virus: A battle for health – Shannon Stiles

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View full lesson: http://ed.ted.com/lessons/cell-vs-virus-a-battle-for-health-shannon-stiles

All living things are made of cells. In the human body, these highly efficient units are protected by layer upon layer of defense against icky invaders like the cold virus. Shannon Stiles takes a journey into the cell, introducing the microscopic arsenal of weapons and warriors that play a role in the battle for your health.

Lesson by Shannon Stiles, animation by Igor Coric.


Dassh says:

The mitochondria its the powerhouse of the Cell!! 

Thabit Mikidadi says:

all of this and you're telling me there's no God.


I feel so strong that I have in army in my cells

Keith Davenport says:

It looks like oxygen molecule is putting up the middle finger

Mario Luigi says:

You didn't answer what happened if the virus was deadly

alrik says:

I'm a virus and I feel offended. We are more symmetric and pretty.

Charlingston says:

The mitochondria is the powerhouse of the cell

Turd Ferguson says:

3:04 That oxygen molecule is flipping you off.

Noor Alam says:

Viruses are particularly dangerous because they don't seem to serve any useful purpose for us . The amount of viruses on earth is far more than the amounts of human .We are outnumbered big time. And we are exposed to them all the time. It is foolish to think that we could kill all viruses. If we have to make human safe from the viruses were either need to quarantine humans from the natural or engineer such a strong immune system that the human body will resist virus attacks of any kind.
But now due to industrialization and advances of science human society has been getting more exposure to viruses than ever before. On the one hand we are traveling more, and thereby coming into contact with more viruses than ever before. On the other hand, by keeping alive millions of children who would have died of all sorts of diseases and by protecting people with all sorts of vaccinations, we are creating an immune system that is now more vulnerable to more things that could be easily battled with an stronger immune system. In other words, we have the worst of both worlds: the human body is getting weaker, and it is getting easier to spread diseases.
Bacteria are far less dangerous than viruses. In fact, most bacteria are useful to us . Our body contains many more bacteria cells than human cells, and we need them as they carry out vital functions such as helping us digest food and even sometimes fighting viruses. Unfortunately, we tend to kill them by the millions when we use antibiotics. An antibiotic does not discriminate between friend and foe, it kills all bacteria in your body. In the old days you would replenish your body simply by breathing them in the air and by drinking natural water . These days we so diligently kill bacteria in the air and in the water that there is virtually no way to replenish them in our body after having exterminated them. Whatever term you want to use for the beneficial work of bacteria, it's being weakened generation after generation.

UniverseReverie says:

The battle of the body was a brutal battle my Grandpa died in that battle

Jenny71026 says:

It took them 6 months to make this..

That's long

RichireX says:

This is so interesting

✪ mZeeHD says:

I aced my cells and functions test with an essay because of this!

Mono krono says:

I'm a universe


this video made me appreciate my body even more

pepa valenta says:

0:20 every living thing on Earth is made of cells… so… virus is dead… right?

Ron TaylorAccosi says:

O2 : Fuck You :)

Oriel Sibonga says:

Why doesn't the cell that got the virus first do it themselves?

Jodh Singh says:

Really helpful!

Austin Heeres says:

I like the animation

mohamad faizuddin says:

awesome.. thanks

DopestDope says:

i liked the part where O2 went in and CO2 came out with a grumpy face. LOL

MJ DT says:

Buen video, se aprende mucho aquí.

Ajay Pratap says:

Now I know some biology too, thanks.

Stefan Kooi says:

This is really cute, and nicely done ^^.

Charles Chiang says:


Kevin Comaduran says:

Like the animation

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