In order to treat hair loss successfully, it is necessary to know about hair. This article discusses general facts about human hair, hair structure and growth. The average human adult body has an astounding 5 million hairs of which 100,000 to 150,000 are on scalp. True blondes have more hair on scalp - 140,000 hairs than brunettes (105,000 hairs) or redheads (90,000 hairs). Hair is made up of a protein called Keratin. Keratin is also a constituent of our nails.
* Hair around world
Hair color and texture differ around world. Asians have jet-black hair whereas Scandinavians have varying shades of browns and reds to pale blonde. There are generally three racial groups with three types of hair.
1.Oriental - People from Japan and China have straight and black hair.
2.Caucasoid - This group is varied and a mixture of several racial groups. The hair colors range from black to blonde. The hair can be wavy or straight.
3.African - African people have black hair that is tightly curled. It is woolly and dry. Heat or chemicals can easily damage this type of hair.
* Hair structure
Some part of hair is hidden under skin, while rest is seen outside body. The part of hair hidden under skin is hair follicle. There are tiny blood vessels at base of follicle that provides nutrition to hair.
Sebaceous glands secrete sebum that keeps hair shiny and waterproof to some extent. At root of hair follicle is papilla, which is where hair grows. Hair follicles are formed when baby is still in womb.