Wiley Diagnostic Chapter 5 – Flashcards
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. What is responsible for the color of gray hair?
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small amounts of pigment in the medulla
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Thick skin is thicker than thin skin mostly because in thick skin _______.
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the stratum corneum is thicker
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Which of the following is true when comparing thin and thick skin?
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Thick skin has a higher density of sensory receptors than thin skin.
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What gives protection against microbes?
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acidic pH of perspiration sebum keratin
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Which of the following contains bacteriacides?
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sebum
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The skin synthesizes a precursor of ______ in response to UV radiation in sunlight.
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Calcitrol
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Which of the following is the very first step in epidermal wound healing?
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basal cells lose contact with basement membrane
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Proliferation of _______ forms all the layers of the epidermis.
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basal cells
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Age spots occur because of ________.
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an increase in the size of some melanocytes
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Older skin tends to be dry and broken because ___________.
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sebaceous glands shrink in size
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Which of the following is NOT an organ system that the skin contributes to by helping activate vitamin D?
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cardiovascular system
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Which of the following is NOT one of the ways that the skin contributes to immunity?
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It helps provide calcium ions.
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The most common form of skin cancer is _____________.
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basal cell carcinoma
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Which of the following is NOT typically considered a risk factor for skin cancer?
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Gender
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Identify the layer located deep to the dermis but not a part of the skin.
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Subcutaneous Layer
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The neural structures located usually in the dermis that are sensitive to pressure are the
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pacinian (lamellated) corpuscles
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Genetic factors, aging and endocrine disorders may contribute to the partial or complete lack of hair. This is called
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Alopecia
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The epidermis is derived from which developmental layer?
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Ectoderm
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A disorder of the skin characterized by inflammation, red patches, blistering and itchy skin is
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Eczema
