Hair color is determined by two melanin pigments produced by melanocytes in the hair bulb. Which pairing is correct?
Explanation
Two melanins are made in the hair bulb by melanocytes adjacent to the dermal papilla. EUMELANIN is the larger oval-shaped pigment responsible for brown and black tones; the more eumelanin and the larger the molecules, the darker the hair. PHEOMELANIN is the smaller, granular pigment responsible for red, orange, and yellow tones. Every hair has BOTH, in varying ratios; that ratio (plus melanin quantity overall) produces the entire natural spectrum. Knowing eumelanin breaks down first during lifting explains why lifted hair always pulls through warm intermediate stages. Cosmetologists apply this under the general competence duties at Bus. & Prof. Code §7320.
Law Reference: Bus. & Prof. Code §7320Practice all 484 questions free — no signup required.
Related questions on this topic
- Which list correctly orders the three phases of the hair growth cycle, from longest to shortest?
- Which list correctly orders the three layers of the hair shaft from the OUTSIDE in?
- The arrector pili muscle is associated with which structure, and what does it do?
- Which list correctly identifies the THREE main layers of the integumentary system from superficial to deep?
- A client mentions during consultation that she takes blood-thinner medication (warfarin) after a heart-valve replacement. The MOST relevant cardiovascular consideration for the licensee is to:
- The sudoriferous glands and the sebaceous glands have different secretions, structures, and purposes. Which pairing is correct?
Last reviewed: · editorial process