Chapter 5 quiz A&PI – Flashcards
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The biggest risk factor for the development of skin cancer is excessive exposure to ultraviolet light.
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True
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In the presence of sunlight, modified cholesterol is converted into Vitamin D precursors in the skin.
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True
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Earwax is made by
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ceruminous glands
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The hyponychium is commonly called the cuticle.
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False
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Which layer of the dermis is directly below the epidermis?
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papillary layer
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Water loss through the epidermis could cause a serious threat to health and well-being. Which of the following protects us against excessive water loss through the skin?
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Lamellated granules of the cells of the stratum granulosum, a glycolipid that is secreted into extracellular spaces.
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Which skin pigment is made in the skin itself?
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melanin
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Melanin protects skin cell DNA from the damaging effects of ultraviolet (UV) radiation.
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True
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Which skin appendages aid in cooling the body to prevent overheating on a hot day or during intense exercise?
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Eccrine sweat glands
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The reason the hypodermis acts as a shock absorber is that ________.
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the major part of its makeup is adipose, which serves as an effective shock absorber
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The pinkish hue of individuals with fair skin is the result of the crimson color of oxygenated hemoglobin (contained in red blood cells) circulating in the dermal capillaries and reflecting through the epidermis
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True
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The protein found in large amounts in the outermost layer of epidermal cells is collagen
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False
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What is the role of the hair matrix?
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The hair matrix produces hair.
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Apocrine glands, which begin to function at puberty under hormonal influence, seem to play little role in thermoregulation. Where would we find these glands in the human body?
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in the axillary and anogenital area
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The hypodermis is distinguished by an abundance of ______.
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fat cells
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The function of the root hair plexus is to ________.
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allow the hair to assist in touch sensation
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Which of the following is NOT a layer of the epidermis?
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stratum reticulum
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The integumentary system is protected by the action of cells that arise from bone marrow and migrate to the epidermis. Which of the following cells serve this function?
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macrophages called dendritic cells (Langerhans Cell)
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Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes ________.
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accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer
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Sam is so cold that he has "goose bumps." What causes goose bumps?
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arrector pili muscles pulling hair follicles into an upright position
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Which structures of the dermis give rise to friction ridges (fingerprints)?
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dermal ridges
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The single most important risk for skin cancer is ________
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overexposure to UV radiation
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A dendritic or Langerhan cell is a specialized ________.
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phagocytic cell
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When an individual is exposed to extremely low air temperatures, the dermal blood vessels will dilate so that blood and heat will be dissipated.
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False
