| A | B |
|---|
| Vertical line | lines that are straight up and down, create length and height in hair design |
| Diagonal line | horizontal and vertical line, they are often used to emphasize or minimize face features |
| Keratin | protein that grows from cell originating within the hair follicle |
| Hair elasticity | hair to stretch and return to it original length without breaking |
| Sebaceous gland | oil gland |
| Sebum | fatty or oil substance secreted by the sebaceous gland that lubricates the skin |
| Melanin | pigment in the cortex that give natural color to the hair |
| Hair porosity | ability of the hair to absorb moisture |
