hair shaft
The cortex, medulla, and cuticle
What are the three layers of the hair shaft structure?
What are the names of the growth cycles?
What are the two parts of a strand of human hair?
Hair shaft and root
Coarse hair
Weak bonds that can be broken by heat or water
What are hydrogen bonds?
Which layer provides strength, elasticity, and color?
The cortex
The growth phase
What is the anagen phase?
Causes the hair to stick up
What is the arrector pili muscle?
The hair's ability to stretch and shrink back to it's normal position
What is elasticity?
The hair, skin, nails, and glands are part of the ____ system?
Integumentary System
Outermost layer of the hair
What is the cuticle?
The phase of the growth cycle in which the hair can be shed
inactive sebaceous glands can cause...
dry hair and dry scalp
The thickness or diameter of a single hair strand
What is texture?
Hair is approximately __ % protein
90
the hair's pith or core
What is the hair's medulla?
The phase of the hair cycle when the follicle canal shrinks and detaches from the dermal papilla
What is the catagen phase?
The structure in the skin or scalp that surrounds the hair root and anchors the hair in the skin
What is the hair follicle?
The ability of hair to absorb moisture
What is hair porosity?
The strands of hair are leaving the follicles at an angle different from the surrounding hairs
What type of hair always has a medulla?
Coarse hair
What will happen if someone's anagen phase is shorter than most?
Their hair will not grow past a certain length
the portion of the hair root that supplies nutrients to the hair
What is the dermal papilla?
The measurement that describes the number of individual hair strands on 1 square inch of the scalp.
What is hair density?
What are the major chemical elements that make up human hair (you can just say the abreviation)
COHNS elements, carbon, oxygen, hydrogen, nitrogen, and sulfur