Layers of Hair
What is the outermost layer of the hair?
The cuticle
Which bond breaks with heat or moisture
Hydrogen bond
What number is neutral on the pH scale?
7
Multiple peptides linked together form what?
What percentage of the hair is made up by water?
Up to 32%
Which layer of the hair is the strongest?
The cortex
_______ bonds are broken when the pH changes.
Salt bonds
Anything that contains _____ will fall somewhere on the pH scale.
Water
When a peptide chain contains enough amino acids it becomes….
A protein
What is the purpose of protein in the hair?
This gives hair its strength!
The _____ layer of the hair can Open and Close
cuticle
Which 2 bonds are easy to break?
Hydrogen and salt bonds
Our hair skin and nails live between….
4.5-5.5
what do amino acids form when they join together?
Peptide
Hair can have up to ___% moisture.
32%
What is the purpose of the medulla?
Disulfide bonds
As pH increases the amount of _____ ions are removed, leaving ______ ions.
Positive, negative
Everything in the hair is wrapped and protected by the ______.
Cuticle
pheomelanin is found in what levels of hair?
Lighter hair
What layer is the melanin found in?
The cortex
Which bond is the most numerous in the hair?
Hydrogen
The pH scales is logarithmic meaning it increases and decreases by _______.
Tenfold
What 5 atoms, are the building blocks of amino acids?
CHONS (carbon, hydrogen, oxygen, nitrogen, sulfur)
What do lipids in the hair do?
They act as glue holding the protein together