Advanced Hair Quiz

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This quiz contains 10 questions. Click below to begin.

Q1. Which signaling pathway is essential for hair follicle morphogenesis?

  • Hedgehog pathway
  • mTOR pathway
  • Notch pathway
  • Wnt/β-catenin pathway

Q2. What is the role of dermal sheath cells during the hair cycle?

  • Provide support and aid regeneration
  • Produce melanin
  • Form outer root sheath
  • Secrete sebum

Q3. Which phase of the hair cycle is characterized by apoptosis and follicular regression?

  • Telogen phase
  • Exogen phase
  • Catagen phase
  • Anagen phase

Q4. Which transcription factor is necessary for hair shaft differentiation?

  • MYC
  • LEF1
  • TP53
  • FOXP3

Q5. What structural component gives hair its tensile strength?

  • Disulfide bonds
  • Collagen helices
  • Elastin fibers
  • Melanin granules

Q6. How do stem cells in the bulge region contribute to hair regeneration?

  • They generate arrector pili muscle
  • They activate and repopulate matrix cells
  • They secrete melanin into cortex
  • They produce sebaceous gland cells

Q7. Which enzyme converts testosterone to dihydrotestosterone (DHT) in hair follicles?

  • Dehydrogenase
  • Tyrosinase
  • Aromatase
  • 5-alpha-reductase type II

Q8. What causes miniaturization of hair follicles in androgenetic alopecia?

  • Overproduction of sebum
  • Autoimmune targeting of hair matrix
  • DHT shortens growth phase and shrinks follicles
  • Increased vitamin D levels

Q9. Which signaling molecule promotes hair growth by stimulating dermal papilla activity?

  • Fibroblast growth factor 7 (FGF7)
  • Interleukin-6 (IL-6)
  • Cortisol
  • Tumor necrosis factor alpha

Q10. What is the role of the inner root sheath in the hair follicle?

  • Anchors hair to arrector pili
  • Synthesizes melanin
  • Regulates blood supply to follicle
  • Shapes and supports the growing hair shaft
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