Formation and Texture Foundations Flashcards
Pre Dry Directional Method
3 Segments with segment one starting at the nape of the neck
Cuticle
colorless translucent scale. Protective cover and protects from injury and moisture loss.
Cortex
85% of the hairs weight. The strongest part of the hair. Consists of numerous twisting fibers of keratin protein. Melanin and keratin protein are found. Partially responsible for the hairs texture and formation
Medulla
Composed of mostly soft keratin. The innermost part of the hair shaft. IF PRESENT may not run through the entire hair fiber and have big void pockets. Function is unknown.
5 Atoms found in hair
Carbon, Oxygen, Hydrogen, Nitrogen and Sulfur
These 5 Atoms make up ________________
and Amino Acid C O H N S (the S is only found in the cysteine amino acid)
Essential Amino Acids
Taken in by Food/Vitamins
Nonessential Amino Acids
Body creates
Polypeptide chains
When multiple peptide bonds are linked together, it creates a polypeptide chain
Helix Coils
Created when polypeptide chains link together with side bonds
Hydrogen Bond
occurs between oxygen and hydrogen molecules
Salt Bond
formed when the positive end of an amino acid chain links the negative end of an amino acid
Disulfide Bond
Bonds link together by two sulfur atoms that are attached to cysteine amino acid
Microfibril
Formed when 7-9 helix coils twist and bind together
Macrofibril
Hundreds of microfibrils are cemented into irregular fibrous bundles
Cortical Cells
Formed from Macro fibril
What determines the diameter of the hair?
The number of helix coils, micro fibrils, macro fibrils and fibrils
Protein
65-95% of the hair and gives the hair strength to stretch and a combination of protein and moisture gives elasticity