Your immune system is made up of cells, glands,
organs, and fluids that are located throughout your body. This system’s
most important job is to fight infections from viruses and bacteria.
Your immune system is like the Army. When foreign
invaders attack, the Army fights back. The same thing happens in your
body every day. Foreign invaders, called antigens, attack your Army
(immune system). The Army sends out soldiers, called antibodies, to
fight the invaders. After the attack is over and the Army has won, the
soldiers disappear. The Army command center has the Intelligence Agency,
or memory cells. Their job is to remember the specific invaders and call
a defense against them if the invaders ever attack again. The protection
the memory cells offer is called immunity.
A normal, healthy immune system is able to produce
millions of these soldiers to defend against thousands of attacks a day.
The immune system is so effective that people do not even notice these
battles going on within their bodies.
Vaccines take advantage of this system. When you
are injected with a vaccine, weakened or dead “foreign invaders” enter
your body. The Army follows the same rules as if the invaders were not
weakened. The Army attacks the invaders and the Intelligence Agency
remembers and watches. Therefore, through vaccination, you develop
immunity without suffering from the actual diseases that vaccines
cutting onions make you cry?
Onions are made up of millions of tiny cells. In
each of these cells, different substances can be found that make an
onion an onion. Two specific substances found in a cell are enzymes and
sulfur, which are kept separated by different compartments.
When you slice through an onion, the knife breaks
open the cells and compartments in its path and lets the enzymes and
sulfur flood out, just like breaking a dam. When these two things mix
together, they interact with each other to make an acid called sulphenic
acid, which is sort of like sulfuric acid.
Sulphenic acid floats up into your eyes. When the
acid makes contact, your eye knows that it should not be there and
begins to water. This watering, or crying, flushes out the acid. This is
the same reaction your eyes have if dust gets into them.
Some ways to keep from crying is to turn on a fan
blowing the acid away from you, cutting the onion under water which
washes away the acid, or by wearing goggles or glasses.