Endogenous Pigments: Lipofuscin
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Questions and Answers

What is another name for lipofuscin?

  • Oxidative pigment
  • Proteofuscin
  • Yellow lipid
  • Aging pigment (correct)
  • Where is lipofuscin accumulation commonly observed?

  • Skin and hair of children
  • Liver and heart of elderly people (correct)
  • Brain and lungs of young adults
  • Muscles of athletes
  • What is the main function of melanin in the skin?

  • Regulating temperature
  • Providing protection against UV radiation (correct)
  • Maintaining hydration
  • Enhancing tactile sensation
  • Which cells produce melanin in the skin?

    <p>Melanocytes</p> Signup and view all the answers

    Which condition is characterized by the localization and depth of pigment in melanocytes?

    <p>Melanocytic nevus</p> Signup and view all the answers

    What is a common sign that points out the malignant transformation of a nevus?

    <p>Growth in mass</p> Signup and view all the answers

    In what races is physiological pigmentation commonly seen?

    <p>Caucasian and Black race</p> Signup and view all the answers

    Which factor stimulates melanocytes due to increased estrogen levels?

    <p>Pigment distribution</p> Signup and view all the answers

    What type of nevus results from malignant degeneration of nevi with junction activity?

    <p>Junction nevus</p> Signup and view all the answers

    Which condition is characterized by small yellow-brown macules and is related to exposure to ultraviolet light?

    <p>Freckle (Efelide)</p> Signup and view all the answers

    Where is smoking-related melanosis commonly observed?

    <p>Maxillary anterior region</p> Signup and view all the answers

    What causes pigmentation along the gingival edges when taking medicine containing arsenic or drinking water contaminated with arsenic?

    <p>Arsenic poisoning</p> Signup and view all the answers

    What is a potential indication of Peutz-Jeghers or Addison’s disease when freckles increase around the mouth?

    <p>Increased melanin production</p> Signup and view all the answers

    Which type of pigmentation can occur in children who have a habit of pencil biting?

    <p>Graphite pigmentation</p> Signup and view all the answers

    What is responsible for systemic melanin hyperpigmentation in chronic poisonings caused by organic mercury compounds?

    <p>Increased melanin production</p> Signup and view all the answers

    Which drug used in AIDS treatment can cause pigmentation in the mucosa or teeth when taken for long periods?

    <p>Zidovudine</p> Signup and view all the answers

    In nevus classification, which type of classification is associated with melanoma formation?

    <p>Junctional nevus</p> Signup and view all the answers

    What is the result of chronic poisoning from drugs containing arsenic on pigmentation?

    <p>Permanent melanin hyperpigmentation</p> Signup and view all the answers

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