What is the cross-section of hair?
The cross-section of a hair Hair generally has the appearance of a highly pigmented shaft with a diameter that varies from 70 μm to more than 100 μm depending on which phase of the cycle it is undergoing.
What are the 3 cross sections of hair?
The hair shaft is comprised of three layers: the cuticle, cortex, and medulla. The cuticle is the hair’s outer most layer which has shingle or scale like cells that overlap.
What is the cross-sectional area of a human hair?
HMI equals to the cross-sectional area of a bundle of hair (mm2) per cm2 of the sample scalp area multiplied by 100. It is equivalent to the Trichometric Index obtained with the trichometer prototype.
Which layers can be identified on the cross-section of the hair shaft?
Each hair shaft is made up of two or three layers: the cuticle, the cortex, and sometimes the medulla. The cuticle is the outermost layer. Made of flattened cells that overlap like the tiles on a terra-cotta roof, the cuticle protects the inside of the hair shaft from damage.
How does hair get its color?
Hair color is determined by the amount of a pigment called melanin in hair. An abundance of one type of melanin, called eumelanin, gives people black or brown hair. When the receptor is turned on (activated), it triggers a series of chemical reactions inside melanocytes that stimulate these cells to make eumelanin.
What are the 5 types of hair?
What does hair type mean?
- straight.
- wavy.
- curly.
- coily.
What is the shape of a cross section piece of head hair?
The shape of hair in cross section is el- liptical and varies from a nearly circular ellipse with major and minor axes approxi- mately equal in length to a more flattened type with the major axis twice the length of the minor axis. Rare modifications im- part a kidney, pear or triangular shape.
What Protein makes up hair?
keratin
Most of the cortical cells are composed of a protein known as keratin (Robbins, 2012). At the molecular level, keratin is a helical protein (Pauling & Corey, 1950). There are two types of keratin fibres that exist in hair: type I with acidic amino acid residues and type II with basic amino residues.