The Integumentary System - Hair March 19, 2015. What is hair? Protein filament that grows from follicles found in the dermis. Defining feature of mammals.

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The Integumentary System - Hair March 19, 2015

What is hair? Protein filament that grows from follicles found in the dermis. Defining feature of mammals. All natural hair colors are the result of two types of hair pigments.

Why do we have hair? Homo Habilis: 1.5 – 2.1 million years ago Early humans had fur. This was lost after moving from forest to open savanna. The one exception was head hair.

What is the purpose of hair? Thermoregulation. Protection against UV light. Did you know…the world record for the longest hair is 18 ft 5.54 inches.

Hair Types Straight hair  Found further from equator  Allows more UV light to pass to the scalp

Hair of different races

Hair in forensics Hair can be used as physical evidence in a wide variety of crimes. The medulla is a collection of cells which appear as a canal running through the center of the cell.

Medulla Patterns