Exam 2 – A&P 1 – Epithelial Tissue – Flashcards
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The skin carries out the first step in the synthesis of vitamin D. True or False.
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True
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Living keratinocytes exfoliate from the epidermis as tiny specks called dander. True or False.
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False
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The deeper of the two layers of the skin is the hypodermis. True or False.
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False
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The youngest keratinocytes are found in the stratum basale. True or False.
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True
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Melanin, hemoglobin, and carotene give color to the skin. True or False.
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True
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Albinism is the genetic lack of melanin that results in a milky white coloration of the skin. True or False.
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True
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Embarrassment can be perceived by an abnormal coloration of the skin called cyanosis. True or False.
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False
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Freckles are elevated patches with an abnormal coloration of the skin. True or False.
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False
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Hair and nails are composed of collagen True or False
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False
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The acidity of sweat contributes to the acid mantle that inhibits bacterial growth in the skin. True or False
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True
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The skin does not include A. the epidermis. B. the papillary layer. C. the hypodermis. D. the stratum basale. E. the dermis.
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C. the hypodermis
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These are all types of cells found in the epidermis except A. melanocytes. B. fibroblasts. C. stem cells. D. keratinocytes. E. tactile (Merkel) cells.
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b. fibroblast
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Skin covering the __________ has sweat glands but no hair follicles or sebaceous (oil) glands. A. forearm B. buttocks C. abdomen D. fingertips E. back
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fingertips
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Most of the skin is ___________ mm thick. A. 0.01 to 0.02 B. 0.1 to 0.2 C. 1 to 2 D. 10 to 20 E. 100 to 200
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1 to 2
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This image shows structures of the skin and subcutaneous tissue. What does "3" represent? A. stratum basale B. stratum spinosum C. stratum corneum D. dermis E. hypodermis
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hypodermis (#3)
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This image shows structures of the skin and subcutaneous tissue. What does "1" represent? A. stratum corneum B. epidermis C. papillary layer D. reticular layer E. hypodermis
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epidermis (#1)
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This image shows structures of the skin and subcutaneous tissue. ________ are found in the layer of the skin represented as "2". A. Collagen and living keratinocytes B. Collagen and dead keratinocytes C. Collagen and fibroblasts D. Elastic fibers and melanocytes E. Elastic fibers and dendritic cells
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collagen and fibroblasts
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This image shows structures of the skin and subcutaneous tissue. Layer "1" represents _____, whereas layer "2" represents ___________. A. simple squamous epithelium; areolar tissue B. stratified squamous epithelium; dense irregular connective tissue C. dense irregular connective tissue; stratified squamous epithelium D. simple squamous epithelium; stratified squamous epithelium E. dense regular connective tissue; stratified squamous epithelium
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stratified squamous epithelium; dense irregular connective tissue
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This image shows strata and cell types of the epidermis. ________ represents a living keratinocyte belonging to the stratum basale. A. "1" B. "2" C. "3" D. "4" E. "5"
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5
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This image shows strata and cell types of the epidermis. "2" represents a _________, whereas "4" represents a _________. A. dead keratinocyte; dendritic cell B. living keratinocyte; dead keratinocyte C. melanocyte; dendritic cell D. living keratinocyte; melanocyte E. melanocyte; living keratinocyte
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living keratinocyte ; melanocyte
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This layer of the epidermis consists of up to 30 layers of dead cells. A. stratum basale B. stratum spinosum C. stratum granulosum D. stratum lucidum E. stratum corneum
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stratum corneum
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Which of the following are associated with the sense of touch? A. fibroblasts B. melanocytes C. keratinocytes D. dendritic (Langerhans) cells E. tactile (Merkel) cells
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tactile (Merkel) cells
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The fastest rate of mitosis happens in the A. stratum basale. B. stratum spinosum. C. stratum granulosum. D. stratum lucidum. E. stratum corneum.
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stratum basale
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These cells stand guard against toxins, microbes and other pathogens. A. keratinocytes B. melanocytes C. adipocytes D. dendritic (Langerhans) cells E. tactile (Merkel) cells
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dendritic (Langerhans) cells
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Fingerprints left on things we touch are associated with A. dermal papillae. B. epidermal ridges. C. stratum basale. D. subcutaneous tissue. E. subcutaneous fat.
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dermal papillae
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Calluses or corns are the result of accelerated multiplication of A. melanocytes. B. keratinocytes. C. fibroblasts. D. tactile cells. E. red blood cells.
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keratinocytes
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The ___ is absent from most epidermis. A. stratum basale B. stratum spinosum C. stratum granulosum D. stratum lucidum E. stratum corneum
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stratum lucidum
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Leather is mostly made of the __________ layer of the dermis, which is very tough due to the high concentration of ____________ fibers. A. areolar; collagen B. areolar; keratin C. reticular; collagen D. reticular; keratin E. papillary; keratin
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reticular; collagen
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The hypodermis usually has an abundance of this tissue. A. epithelial tissue B. muscular tissue C. nervous tissue D. adipose tissue E. keratinized tissue
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adipose
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The reddish color of the skin of the lips is primarily due to this pigment. A. hemoglobin B. myoglobin C. melanin D. carotene E. keratin
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hemoglobin
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Ethnic differences in skin color are primarily caused by differences in A. UV radiation exposure. B. quantity of hemoglobin carried in the blood. C. quantity of melanin produced. D. number of melanocytes. E. number of keratinocytes.
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quantity of melanin produced
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A ___ is an elevated patch of melanized skin. A. hemangioma B. mole C. freckle D. flexion line E. friction ridge
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mole
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A pilus is A. a hair. B. a hair follicle. C. a tiny muscle that moves a hair. D. a sensory nerve fiber around the base of a hair. E. a gland associated with a hair follicle.
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a hair
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Blood vessels in the _________ provide a hair with its sole source of nutrition. A. bulb B. root C. shaft D. dermal papilla E. medulla
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dermal papilla
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This image shows the structure of a hair and its follicle. What does "1" represent? A. bulb B. root C. shaft D. medulla E. cuticle
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bulb
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The contraction of the piloerector muscles (pilomotor muscle or arrector pili) in humans causes A. hairs to stand on end trapping an insulating layer of warm air next to the skin. B. generation of heat to raise the body temperature. C. hairs to stand on end to make the individual appear bigger. D. hairs to stand on end with no apparent function. E. increased ability to feel pain.
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hairs to stand on end with no apparent function
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Each hair grows in an oblique epithelial tube called a(an) A. hair follicle. B. vellus. C. pilus. D. bulb. E. dermal papilla.
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hair follicle
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37. Mitosis in the __________ accounts for growth of the nail. A. nail plate B. nail fold C. eponychium D. hyponychium E. nail matrix
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nail matrix
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The oil of your scalp is secreted by __________ glands associated with the hair follicles. A. merocrine sweat B. apocrine sweat C. sebaceous D. ceruminous E. mammary
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sebaceous
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Secretions from __________ glands contribute to the acid mantle that inhibits bacterial growth on the skin. A. mammary B. ceruminous C. sebaceous D. sweat
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sweat
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____________ is/are formed partly from the secretions of glands in the external ear canal. A. Sebum B. Cerumen C. Sweat D. Scents E. Mucus
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cerumen
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Which two strata of the epidermis are most susceptible to cancer? A. corneum and lucidum B. basale and corneum C. spinosum and basale D. granulosum and spinosum E. lucidum and granulosum
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spinosum and basale
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The least common but most deadly type of skin cancer is A. basal cell carcinoma. B. squamous cell carcinoma. C. melanoma. D. skin lymphoma. E. skin sarcoma.
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melanoma
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Each hair grows in an oblique epithelial tube called a(an) A. hair follicle. B. vellus. C. pilus. D. bulb. E. dermal papilla.
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hair follicle
