113.V/NAIL THEORY LESSON CHALLENGE Multiple choice. Indicate the correct answer for each question. 1. Which part of the nail serves as a watertight seal that protects the matrix against infection? a. eponychium b. lunula c. mantle d. hyponychium 2. The part of the nail plate that extends beyond the end of the finger is called the: a. sidewall c. eponychium b. free edge d. hyponychium 3. The living tissue that overlies the nail plate on the sides of the nail is known as the: a. mantle c. lunula b. eponychium d. perionychium 4. The nail plate rests on which area of the nail? a. sidewall c. nail bed b. free edge d. nail groove 5. The study of the structure and growth of the nails is called: a. onyx C. onychology b. etiology d. keratinization 6. A protein substance found in nails, skin and hair is: a. keratin c. lunula b. cuticle d. epithelium 7. Another term for tinea pedis is: a. athlete's foot c. tinea unguium b. hangnail d. contact dermatitis 8. A loosening or separation of the nail is referred to as: a. paronychia c. onycholysis b. corrugations d. onychocryptosis 9. Another name for split or brittle nails is: c. leukonychia a. agnails d. onychorrhexis b. onychophagy 10. Another term for bitten nails is: C. onychogryposis a. onychoptosis d. onychorrhexis b. onychophagy