The Medulla Oblongata
Technical name for the study of hair
What is Trichology
Portion of hair that extends above skin’s surface
What is Hair Fiber
Process of cells changing shape, drying out and forming keratin protein
What is Keratinization
Referred to as mottled hair
What is Gray Hair
The active growing stage of hair growth
What is anagen
Hair grows from a tube-like “pocket” called a root sheath or a(n):
what is a follicle
Portion of hair inside the hair follicle under the skin’s surface
What is Hair Root
Central core of hair shaft
What is the Medulla
The resting stage of hair growth
What is Telogen
The outer covering of the hair shaft made up of overlapping layers of transparent scales
What is Cuticle
Melanin that is brown/black in color
What is Eumelanin
The shape of the follicle will determine the shape of the
What is hair shaft
Undergo cell division; produce cells that form layers of the hair
What is Germinal Matrix cells
Pheomelanin is ____/____ in color.
what is red/yellow
The second layer of hair that gives hair most of its pigment and strength (elasticity)
What is the cortex
A brief transitional stage of hair growth, when all cell division stops
What is Catagen
Filled with capillaries that supply nourishment to cells
What is the Papilla
Causes hair to stand on end when a person is scared or cold
What is Arrector Pili Muscle
Melanocytes produce melanosomes, which contain the pigment
What is Melanin
Hair is primarily made up of
What is Protein
What helps prevent the hair and skin from becoming too dry?
What is sebum
Primitive hair germ forms in the ____ layer of the epidermis
What is basal
Sebum oil mixes with perspiration to form the_____ _____
What is acid mantle
melanocytes produce _________, which contain the pigment melanin.
What is melanosomes
Catagen, a brief transitional stage, lasts for what amount of time?
What is only a few weeks