There are three different kinds of tears: those that lubricate our eyes, the kind that we cry when we are emotionally upset, and the kind that we cry when we are injured.<br />
These tears actually do have a different chemical makeup. The tears that we cry when we are sad have a chemical in them to help lift us up emotionally. The tears we cry when we are injured have an anti-bacterial component to them. <br />
I'm sure there are special names for the specific kinds of tears, but I don't know them. I just know what makes them different from each other. Hope this helps!
Tear ducts are actually little 'tubes' that drain tears into your nasal cavity. That's why your nose runs when you cry. Tears don't come out of our eyes...they are actually a result of the tear ducts filling up and spilling over - down our cheeks.<br />
What actually keeps your eye moist is the lacrimal gland, in the upper outer part of your eye (not eyeball). When you bl<x>ink, the motion sweeps a thin film of moisture over the eyeball.<br />
Hope that helps :)
I would think that tears come out of our eyes as a way of showing a facial gesture. Other than body language, every emotion we have can be seen on our faces. So since we as humans determine other's moods by that, that's probably why it happens. We smile when happy which I believe originally meant "I'm harmless, don't hurt me" (To our predecessors, it was probably similar to a dog rolling on it's back with it's stomach exposed to it's peers.), and the same can be said about most other emotions.
So they dont come out your bellybuttin
well we wind ourselfs up so maybe the tears prevent us from crying so hard we die???
Tears serve to clean our eyeballs.