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Chapter 18 Skin - 18 The Skin Instruction Match the...

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18 The Skin Instruction: Match the numbered words or phrases with the most appropriate lettered items. Each lettered item can be used more than once. Instruction: Choose the one best answer. 21. Diabetes predisposes the skin to: A. Tumors B. Autoimmune diseases C. Infections D. Hyperplasia E. Hyperpigmentation Answer: C 23. Flat, slightly pigmented skin patch measuring 1 cm is best classified as a: 25. Prolonged suntanning causes: 26. Impetigo is typically caused by: 27. Ringworm lesions are caused by: A. Worms B. Parasites C. Fungi D. Bacteria E. Viruses Answer: C
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28. Measles present with: 29. The most common epithelial malignant tumor of the face is: 30. Preinvasive carcinoma of the sun-exposed skin is called: 31. Malignant melanoma may originate from: A. Seborrheic keratosis B. Basal cell carcinoma C. Lentigo D. Urticaria pigmentosa E. Mycosis fungoides Answer: C ANSWERS TO TEXT “REVIEW QUESTIONS” 1. What are the main histologic components of the epidermis, dermis, and subcutis? The skin is composed of three layers: the epidermis, dermis, and subcutis. The main histologic components of the epidermis are keratinocytes and melanocytes. Basal keratinocytes undergo maturation to form a protective keratin layer on the surface of the skin. Melanocytes produce melanin, which provides protection against the harmful effects of ultraviolet (UV) light. The dermis consists of a vascularized, collagen-rich connective tissue. Skin appendages arising in the dermis include hair follicles and sweat glands. The subcutis (or hypodermis) is predominantly composed of fat cells and connective tissue. 2. What are the main functions of the skin? The main functions of the skin are protection against injury, thermoregulation, immunity, and (in an evolutionary sense) decoration. 3. Give clinical examples of a macule, patch, papule, vesicle, pustule, plaque, ulcer, and nodule.
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Clinical examples of various types of skin lesions are listed below. Lesion Clinical Example Macule Freckles Patch Measles rash Papule Eczema Vesicle Herpes, vesicle Pustule Impetigo Ulcer Syphilitic chancre Nodule Nevi/mole 4. What is ichthyosis? Ichthyosis is an autosomal dominant scaling skin disease. Children are born with thick squames resembling fish skin.
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