Iowa Cosmetology Practice Exam

The primary elements of hair are carbon, hydrogen, oxygen, nitrogen, and sulfur. These elements are essential components of the amino acids that form the proteins in hair, such as keratin.

Carbon serves as the backbone for organic molecules, including the keratin structure that makes up the majority of hair. Hydrogen and oxygen are critical in the formation of water molecules, which are vital for maintaining the moisture balance within the hair. Nitrogen is a key element in amino acids, particularly in the formation of the protein structure, while sulfur plays a role in the formation of disulfide bonds, which contribute to the strength and stability of the hair's keratin structure.

Understanding these elements is important for cosmetology professionals as they relate to the health and treatment of hair, including practices such as coloring, perming, and conditioning, which can all affect these elemental components and, consequently, the hair's overall condition.