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Functions Of Hair - The Purpose Of Hair - Why Do We Have Hair

In this video we discuss some of the functions of human hair. We cover how hair provides protection for the body, allows for heat retention, and how it plays a role in attracting people to one another. Transcript/notes Functions of hair. It is estimated that a human has about 5 million hairs distributed throughout different areas of the body, and hair, well it has many important functions for the body. Hair provides protection as hair on the head protects the scalp from sunburn, nostril hair in the nose traps particles, acting like a filter, protecting the respiratory system. The inner ear has hair that protects against insects and foreign particles entering into the body, and the eyelashes provide protection for the eyes. Another function of hair is facial expression as the eyebrows can convey someone’s emotional state. Heat retention is another function of hair, as the hair on the scalp helps to prevent heat loss from the head. You can see this as some football players with shaved heads release a cloud of heat in cold weather games. Hair plays a role in sensory reception as hair root plexuses can detect light touch such as when you put on a long sleeve shirt. Hair also provides visual identification as you can identify someone you know while standing in back of them, by their hair color and hair style. Hair also plays a role in attracting persons of the opposite sex, as hair helps in releasing chemicals called pheromones, which are secreted by sweat glands onto hairs. Timestamps 0:00 Intro - hair provides protection 0:33 Heat retention 0:45 Sensory reception and visual identification 1:02 Physical attraction