Tears are the liquid product of a process of crying to clean and lubricate the eyes Eyes are organs that detect light, and send electrical impulses along the optic nerve to the visual and other areas of the brain. Complex optical systems with resolving power have come in ten fundamentally different forms, and 96% of animal species possess a complex optical system. Image-resolving eyes are present in cnidaria, molluscs, chordates,. The word lacrimation (from L. Lacrima meaning Tear) (also spelled lachrymation) may also be used in a medical or literary sense to refer to crying To cry or weep is to shed tears as a response to an emotional state in humans. The act of crying has been defined as "a complex secretomotor phenomenon characterized by the shedding of tears from the lacrimal apparatus, without any irritation of the ocular structures". The medical term for this is to lacrimate, which also refers to non-. Strong emotions, such as sorrow or elation Happiness is a state of mind or feeling characterized by contentment, love, satisfaction, pleasure, or joy. A variety of philosophical, religious, psychological and biological approaches have striven to define happiness and identify its sources, may lead to crying. The process of yawning may also result in lacrimation. Although most land mammals have a lacrimation system to keep their eyes moist and in response to other stimuli, humans are the only mammal generally accepted to cry emotional tears.[1]
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