Q:1- What is Scalp and Composition of Hair

        Actually scalp is nothing but the skin on the head, which is similar to the body skin. The scalp like the skin elsewhere in the body consists of two layers--- the dermis and the epidermis. However, larger and deeper hair follicles are present on the scalp to accomodate the longer hair of the head.

Now let me share the most essential info about The Hair Composition:
The Chemical Composition of Hair is:
                                            Carbon: 50.56%
                                           Hydrogen:  6.38%
                                           Nitrogen: 17.14%
                                             Sulphur:  5.00%
                                             Oxygen:20.85%
This Composition varies with color of the hair. The Hair is also composed of a protein called "Keratin".
Full grown Hair is divided into two parts - the root and the Shaft.
          The rate of hair growth varies from person to person.The average growth of hair is approximately 1/4 inch/month i.e, 1/16 inch /week. The growth of Hair is always greater between the ages of 20 and 30yrs & faster in summer than in winter. The growth of hair is cyclical, i.e after a few years of growth , the hair enters a phase of inactivity, then dies & falls. A hair dies when its bulb is separated from the papilla that feeds it. The hair bulb is a thickened club-shaped structure forming the lower part of the hair root.