The major elements that make up human hair are carbon, oxygen, hydrogen, nitrogen, and sulfur, often referred to as the:

The units of structure that build protein and are joined together end to end like pop beads are:

The five main structures of the hair root include all of the following except the:

Which layer of the hair shaft creates the shine and the smooth, silky feel of healthy hair?

The substance secreted by the sebaceous glands is called:

The melanin that provides brown or black color to hair is:

The thickened, club-like structure that forms the lower part of the hair root is the:

Which of the following terms is used to describe hair’s wave pattern?

The study of the hair and scalp including its disorders and diseases is?

The three different types of side bonds are:

The tiny, involuntary muscle fiber in the skin inserted in the base of the hair follicle is the:

The fibrous protein core formed by elongated cells that contains melanin pigment is the:

Hair is composed of protein that grows from cells originating within the:

All natural hair color is the result of pigment located in the cortex called:

The hair, skin, nails, and glands are known collectively as the:

A long chain of amino acids linked by peptide bonds is called a:

The pocket or tube-like depression in the scalp or skin that contains the hair root is the:

A weak, physical, cross-link side bond between adjacent polypeptide chains that is broken by changes in pH is a: