Skin Layers and Melanin Production
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Questions and Answers

Which layer of the epidermis consists of 2-3 layers of anucleate, dead cells?

  • Stratum spinosum
  • Stratum granulosum
  • Stratum basale
  • Stratum lucidum (correct)
  • Where are Langerhans cells mainly found in the epidermis?

  • Stratum corneum
  • Stratum basale
  • Stratum granulosum
  • Stratum spinosum (correct)
  • What is the main function of Merkel cells in the epidermis?

  • Mechanoreceptors to light touch (correct)
  • Phagocytose antigens
  • Participate in immune response
  • Produce keratins
  • Which type of cells give rise to keratinocytes in the epidermis?

    <p>Cells from stratum basale</p> Signup and view all the answers

    What is the primary function of Langerhans cells in the epidermis?

    <p>Recognize and process foreign antigens</p> Signup and view all the answers

    In which layer of the epidermis are keratinocytes most abundant?

    <p>Stratum basale</p> Signup and view all the answers

    Which layer of the skin is known as the integument or cutaneous layer?

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

    What is the function of the dark pigment melanin in the skin?

    <p>Protects against ultraviolet (UV) radiation</p> Signup and view all the answers

    In which layer of skin does renewal occur approximately every 15-30 days?

    <p>Stratum basale</p> Signup and view all the answers

    Which layer of the skin is mainly made up of keratinized cells?

    <p>Stratum lucidum</p> Signup and view all the answers

    Which layer of the skin is classified as part of the ectodermal origin?

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

    What is the main function of the hypodermis/subcutaneous layer?

    <p>Storage of areolar and adipose connective tissue</p> Signup and view all the answers

    What is the primary function of melanin in the skin?

    <p>To protect against UV rays</p> Signup and view all the answers

    Which type of melanin is responsible for a red color in the skin?

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

    What determines the skin color of an individual?

    <p>The activity of melanocytes</p> Signup and view all the answers

    Which layer of the dermis contains structures like sebaceous glands and hair follicles?

    <p>Reticular dermis</p> Signup and view all the answers

    What is the primary function of Langer's lines in the dermis?

    <p>To orient collagen fibers</p> Signup and view all the answers

    Which sensory receptor in the epidermis is responsible for detecting fine touch and pressure?

    <p>Merkel's corpuscle</p> Signup and view all the answers

    Which type of skin contains Pacinian corpuscles to detect pressure and vibrations?

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

    Where are Meissner’s corpuscles mainly located?

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

    Which nerve receptor is associated with detecting skin stretch and torque?

    <p>Pacinian corpuscles</p> Signup and view all the answers

    In which type of skin would you NOT find sebaceous glands?

    <p>Thin skin on the scalp</p> Signup and view all the answers

    Where is the free edge of a nail located?

    <p>Nail groove</p> Signup and view all the answers

    What type of skin is characterized by having hair follicles present and apocrine glands absent?

    <p>Thin skin on the limbs</p> Signup and view all the answers

    What structure corresponds to the stratum basale of the epidermis in the nail?

    <p>Nail matrix</p> Signup and view all the answers

    Which gland is widely distributed in the skin and numerous on the soles of the feet?

    <p>Eccrine sweat gland</p> Signup and view all the answers

    What muscle is responsible for pulling the hair shaft to a more erect position?

    <p>Arrector pili muscle</p> Signup and view all the answers

    Where do the ducts of apocrine sweat glands open?

    <p>Into hair follicles</p> Signup and view all the answers

    What disorder is characterized by abnormal keratinocyte proliferation and dermal immune cell infiltration?

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

    Which structure is a concave nail dystrophy known as spoon nails?

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

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