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25 Cards in this Set
- Front
- Back
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What are the 3 layers of the skin?
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Epidermis, dermis, subcutaneous/hypodermis
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In what layer of the skin are melanocytes found?
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Epidermis
Stratum basale and stratum spinosum |
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What is the bottom layer of the epidermis?
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Stratum basale
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What type of epithelial tissue lines heart, blood, and lymphatic vessels?
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Simple squamous endothelium
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What type of epithelial tissue forms the epithelial layer of serous membranes?
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Simple squamous mesothelium
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What is the function of simple cuboidal epithelial tissue?
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Secretion and absorption
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What area of the body contains stratified transitional epithelium?
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Bladder
(in relaxed state it is stratified cuboidal; in stressed state it is stratified squamous) |
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What is the most numerous epidermal cell?
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Keratinocyte
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What is a Langerhans cell?
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Located in epidermis (stratum basale and stratum spinosum); Arises from bone marrow and presents antigens to helper T cells
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What is a Merkel cell?
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Found in epidermis of hairless skin (stratum basale); detects pressure
continuous signal |
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Name the layers of the epidermis from top to bottom.
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Stratum corneum
Stratum lucidum Stratum granulosum Stratum spinosum Stratum basale |
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What is found in the stratum granulosum?
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3-5 rows of flattened keratinocytes
Keratohyalin Lamellar granules |
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What layer of the epidermis is most apparent in the skin of the palms and soles?
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Stratum lucidum
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What are the two regions of the dermis?
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Papillary
Reticular |
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What is contained in the papillary region of the dermis?
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Areolar connective tissue
Fine elastic fibers Dermal papillae Meissner's corpuscles |
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What are Meissner's corpuscles?
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Located in dermis; sense motion; rapidly adapting signal
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What is located in the reticular region of the dermis?
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Dense irregular connective tissue
Randomly scattered collagen fibers and some elastic fibers Adipose tissue Hair follicles Nerves, sebaceous glands, sweat glands |
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What are nociceptors?
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Free nerve endings found in all parts of the body; act as pain receptors
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How many melanocytes are in one square inch of skin?
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60,000
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How many sweat glands are in one square inch of skin?
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650
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How many nerve endings are in one square inch of skin?
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Over 1000
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What is the main function of Vitamin D?
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Absorption and homeostasis of calcium
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What vitamin is synthesized in skin?
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Vitamin D3
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What diseases are people who have little exposure to sunlight most susceptible to?
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Rickets
Osteomalacia |
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What is vitamin D3 metabolized to in the liver?
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Calcitriol
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