Chapter 5 quiz A&PI

question

True
answer

The biggest risk factor for the development of skin cancer is excessive exposure to ultraviolet light.
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True
answer

In the presence of sunlight, modified cholesterol is converted into Vitamin D precursors in the skin.
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ceruminous glands
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Earwax is made by
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False
answer

The hyponychium is commonly called the cuticle.
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papillary layer
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Which layer of the dermis is directly below the epidermis?
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Lamellated granules of the cells of the stratum granulosum, a glycolipid that is secreted into extracellular spaces.
answer

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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melanin
answer

Which skin pigment is made in the skin itself?
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True
answer

Melanin protects skin cell DNA from the damaging effects of ultraviolet (UV) radiation.
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Eccrine sweat glands
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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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the major part of its makeup is adipose, which serves as an effective shock absorber
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The reason the hypodermis acts as a shock absorber is that ________.
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True
answer

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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False
answer

The protein found in large amounts in the outermost layer of epidermal cells is collagen
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The hair matrix produces hair.
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What is the role of the hair matrix?
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in the axillary and anogenital area
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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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fat cells
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The hypodermis is distinguished by an abundance of ______.
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allow the hair to assist in touch sensation
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The function of the root hair plexus is to ________.
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stratum reticulum
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Which of the following is NOT a layer of the epidermis?
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macrophages called dendritic cells (Langerhans Cell)
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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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accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer
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Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes ________.
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arrector pili muscles pulling hair follicles into an upright position
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Sam is so cold that he has “goose bumps.” What causes goose bumps?
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dermal ridges
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Which structures of the dermis give rise to friction ridges (fingerprints)?
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overexposure to UV radiation
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The single most important risk for skin cancer is ________
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phagocytic cell
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A dendritic or Langerhan cell is a specialized ________.
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False
answer

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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