The human immune system is the most complex biological system. We know after the human brain and yet most of us never learn how it works all walked. Today's your immune system consists of hundreds of tiny and to law opens it. Has it's own transport networks spread throughout job on every day it makes hundreds of billions of fresh cells organized like an army with soldiers, captains, intelligence officers, heavy weapons and crazy suicide bombers. 

It's not some sort of abstract entity, your immune system. Is you your biology, protecting you from the billions of microorganisms that wants to consume you banned from your own, a vested cells that turn into cancer? It soon manifold that it's impossible to cover in one video, so it will make a series looking at different times aspects of it today. 

What happens when your body is invaded and you'll first lines of defense is: are engaged, find the fun life and death. It's been a normal day when, suddenly the world expose an asteroid, rips the sky opened countless alien life forms, invite ready to destroy cities and infrastructure and eat civilians. Whole. This is won't show sounds experience. 

You look at your bleeding from that. You just constantly desi twig in the park, how annoying, but inside the wound, a horrible catastrophe has happened. There are dead cells and blood and dust everywhere. Even worse, countless bacteria invade the cabins between y'all, helpless cells to explore all that new home steal your resources and poop everywhere, image and name the first stage of your defense, cakes in the cells that survive the impact, that's all dying, scream in panic. 

Releasing an onslaught of chemical alarm signals. This awaken your immune system, the first cells to show up on macrophages if an average cell with the size of a human, a macrophage will be the size of a black rhino, a stone excel in principle, but you wouldn't want to annoy it bacteria. Do the noise within seconds the launch cells, attack and begin cutting them without messing. 

They stretch out and hans like the arms of an oped and grab the bacteria to swallow them whole and digest them. A knife and a macrophage can h one hundred bacteria before it's exhausting there aren't too many enemies, so the macrophages comb for reinforcements and your blood. Hundreds of thousands of neutral fails, pick up that signals and moved to the battlefield in neutral fills our intense suicide warriors that only have to kill vast to enthusiasts.