Crying: The Mystery of Tears

able to cry ACTH adult crying behavior animals shedding emotional average body Boston terriers Brunish catecholamines cause cells chemical continuous tears cried crying behavior crying behavior study crying episodes crying frequency depression dry eye syndrome ducts Elaine Morgan elephant emotional and irritant emotional crying emotional stress epiphora excrete excretory eyelid feel better felt flow flowing tears function grief hormones horseradish human lacrimal gland human tears irritant tears lacrimal gland lacrimal system leucine-enkephalin lysozyme manganese menstrual cycle movie nasolacrimal ducts nerve neurotransmitters normal occur Ophthalmology persons physiological prolactin prolactin levels protein protein concentration psychogenic tears questionnaire reasons reflex tears release role secretion shed emotional tears sobbing someone SPRMC strong emotion subject wrote subjects reported substances sympathetic tear and crying tear film tear protein tear research tear study tears in response tears shed theory thought tion tional tears types of tears weeping wept woman women