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12 Cards in this Set
- Front
- Back
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integumentary system
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the skin and its accessory structures--hair, nails, various glands, muscles, and nerves--make up this system
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skin or cutaneous membrane
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one of the largest organs of the body in terms of surface area and weight (2 m2, 4.5-5.0 kg or 10-11 lbs)
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organ
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an aggregation of tissues of definite form and usually recognizable shape
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system
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a group of organs that operate together to perform specialized functions
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thermoregulation
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regulation of body temperature
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List the functions performed by the skin.
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1. regulation of body temperature
2. protection of underlying tissues from physical abrasion, microorganisms, dehyddration, and ultraviolet UV radiation 3. excretion of salts and several organic compounds 4. absorption of certain lipd-soluble materials 5. synthese of vitamin D 6. reception of stimuli for touch, pressure, pain, and temperature change sensations 7. serves as a blood reservoir 8. immunity |
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epidermis
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the superficial, thinner layer of skin which is avascular
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dermis
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the deeper, thicker layer of skin which is vascular
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subcutaneous (subQ)layer (hypodermis)
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anchors the skin to underlying tissues and organs--contains nerve endings sensitive to pressure called lamellated or pacinian corpuscles
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lamellated/pacinian corpuscles
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nerve endings sensitive to presssure (within the subQ)
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What type of cells is the epidermis composed of?
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It consists of 4 principal kinds of cells: Keratinocytes, Melanocytes, Langerhans cell, Merkel cells
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Keratinocytes
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they are the most numerous in a cell--arranged in four or five layers
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