Toxic Materials Absorbed Through the Skin Quiz
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Questions and Answers

Which region of the body allows for the most rapid transdermal absorption due to the thinness of the stratum corneum?

  • Hands
  • Scrotum (correct)
  • Back
  • Chest
  • What is the precursor to vitamin D3 that is converted in the skin upon exposure to ultraviolet rays?

  • Parathyroid hormone
  • 7-dehydrocholesterol (correct)
  • Calcitriol
  • Cholecalciferol
  • Individuals who avoid sun exposure or live in colder climates may require vitamin D supplements to prevent which condition?

  • Scurvy
  • Kwashiorkor
  • Rickets (correct)
  • Osteoporosis
  • What is the active form of vitamin D that stimulates the small intestine to absorb calcium and phosphate?

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

    Which process is enhanced by vitamin D and involves increased production of antimicrobial substances in phagocytes?

    <p>Immune response</p> Signup and view all the answers

    In the kidneys, what converts 25-hydroxycholecalciferol into calcitriol, the most active form of vitamin D?

    <p>Parathyroid hormone (PTH)</p> Signup and view all the answers

    How does the skin help reduce water loss?

    <p>By acting as a barrier to the diffusion of water through lipids</p> Signup and view all the answers

    Which of the following is NOT a function of melanin in the skin?

    <p>Promotes wound healing processes</p> Signup and view all the answers

    What is the primary role of sebum released by sebaceous glands?

    <p>To protect against harmful microbes and dryness</p> Signup and view all the answers

    How does the acidic pH of perspiration contribute to skin protection?

    <p>It retards the growth of some microbes</p> Signup and view all the answers

    Which cells within the skin have immunological functions related to microbial defense?

    <p>Intraepidermal macrophages</p> Signup and view all the answers

    How do blood vessels in the dermis contribute to overall body temperature regulation?

    <p>By constricting to conserve heat</p> Signup and view all the answers

    How does the skin contribute to thermoregulation?

    <p>By liberating sweat at the skin's surface and adjusting blood flow in the dermis</p> Signup and view all the answers

    Which type of skin has a thicker epidermis and is more associated with thermoregulation?

    <p>Thick skin</p> Signup and view all the answers

    Which of the following is a function of eccrine sweat glands in thermoregulation?

    <p>Evaporation of sweat for cooling</p> Signup and view all the answers

    What role do blood vessels in the dermis play in response to high environmental temperature?

    <p>They dilate to increase heat loss</p> Signup and view all the answers

    What local variations are related to the skin's vascularity?

    <p>Pigmentation and innervation</p> Signup and view all the answers

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