Topic 22: Science of Tears

Everyone cries, its part of being human, even if we don’t like crying it is hard wired into us. From the moment you are born, crying is one of the first things you do, you will cry for your whole life. So sit back grab some tissues and enjoy my article.

We have three types of tears, basal, reflex, and emotional. Basal tears are that consistent water that is always over your eye. Reflex tears are tears that occur when a foreign object gets in your eyes or when you are in pain, they have more healing proterites than the other types of tears. Emotional tears form when you are sad, stresses, over joyed and in extreme emotions, they are  protein-based hormones and clean your body of chemical that are pent-up emotions.

A tear is made up of three different parts. Outermost layer is an oily layer that keeps the tear from evaporating. The middle layer carries vitamins and minerals to the cornea, (including salt, that is why they taste salty. Inner most layer is the layer that moisturizes the eye.

Where do tears come from? tears start from the lacrimal glands and  the conjunctiva (tissue that is on your inside of your eye lid). The tear comes down and coats the eye,  they go into the lacrimal sacs, which are in the inner corner of your eye and then fall out, either running down your cheek or slipping from your eye. The tear then drain into the nasal passage, that is why you get a stuffy nose when you cry.

Facts:

  • The chemical make up of a tear is similar to saliva
  • women cry more than men. Women cry 5.2 times per month while men cry 1.4 times per month.
  • The average crying session for women last about 6 minutes and 2-4 minutes for men
  • Women are biologically wired to cry. Tear glands in men look different to those of women
  • crocodile tears are true. Crocodiles actually do cry.
  • you produce 5-10 ounces of tears per day
  • As you get older your eyes produce less tears

“Tears are words the heart can’t say”- Anonymous 

Bibliography:

https://www.vsp.com/tear.html

http://www.medicaldaily.com/pulse/why-do-we-cry-three-different-types-tears-and-their-physiology-331708

http://www.independent.co.uk/life-style/health-and-families/features/why-do-we-cry-the-science-of-tears-9741287.html

http://www.berkeleywellness.com/self-care/preventive-care/slideshow/8-fascinating-facts-about-tears

http://www.huffingtonpost.com/2014/01/10/tear-facts_n_4570879.html

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