Have you ever wondered why we cry, exactly? Our eyes have this salty chock fluid full of protein, water, and mucus and oil released from the lacrimal gland in the upper, outer region of your eyes. This fluid is better known as tears.
There are three types of tears for different purposes:
1. Basal Tears are omnipresent in our eyes. These constant tears keep our eyes from drying out. The human body produces an average of 5-10 ounce of tears each day. They drain in our nasal cavity, which is the reason why many of us develop a runny-nose after a good sobfest.
2. Reflex tears protect our eyes from harsh irritants such as smoke, onions, dusty wind, etc. The sensory nerves in your cornea deliver this irritation to your brain stem, which in turn send hormones in the eyelids. These hormones cause the eyes to produce tears, effectively ridding the irritation off.
3. Emotional tears. It starts in the cerebrum where sadness is registered. The endocrine system is then triggered to release hormones to the ocular area, which then causes tears to form. Emotional tears are common among people who see Bambi's mother die or who suffer personal losses.
TRIVIA: In Japan, some people have taken the notion of "a good cry" to the next level. They hold organized crying clubs where they watch sad movies and television shows and read tear-inducing books.
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