Like snow flakes and fingerprints, no tears are alike. There are three major types of tears: basal, reflex, and psychic (triggered by emotions). All tears contain organic substances including oils, antibodies, and enzymes and are suspended in salt water. Different types of tears have distinct molecules. Emotional tears have protein-based hormones including the neurotransmitter leucine enkephalin, which is a natural painkiller that is released when we are stressed. Plus, the tears seen under the microscope are crystallized salt and can lead to different shapes and forms. So even psychic tears with the same chemical composition can look very different. Fisher said, “There are so many variables—there’s the chemistry, the viscosity, the setting, the evaporation rate and the settings of the microscope.”
Posted on: Tue, 01 Jul 2014 19:02:31 +0000
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