204 Hair Structure Flashcards
What is the hair structure made of
Protein called keratin
What is the PH of the scalp and hair
4.5 to 5.5
Detail the physical characteristics of the cuticle
Overlapping colourless scales
12 layers
Lays flat from root to point
What does the cuticle do
Protect inner structure of the hair
Smooth cuticle equals…
Healthy hair
What opens the hair cuticle
What closes the hair cuticle
Weak alkaline open cuticle
Weak acids close cuticle
What is the medula, what does it do
No known structure
Rarely found in fine hair
Describe the main characteristics of the cortex
Main structure of the hair
Give hair pigment & melanin
The cortex polypeptide chains are held together by what
Permanent and temporary hydrogen bonds
Where do non chemical and chemical changes take place
Cortex
Describe how the hair strand looks
Outer layer is the cuticle (jagged edges)
Rectangle inner layer is cortex
Skinny rectangle in the middle is medula
What is the natural state of the hair called
Alpha keratin
What is hair that has been temporarily changed called
Beta keratin
What are the pros and cons of using hot water
Removes dirt/ oil build up
Causes frizz
Makes colour fade fast
Makes hair dry and brittle
What are the pros and cons of using cold water
Seals moisture
Increases shine
Makes hair flat and less bouncy
Smooths hair
