Anatomy and Physiology

Biology

Quiz 5 :

The Integumentary System

Quiz 5 :

The Integumentary System

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Describe a typical strand of hair.
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In a strand of hair, its base is called the hair matrix, where hair growth occurs via epithelial stem cell divisions. As new hair is generated, it is pushed upward away from the hair matrix. The portion of hair that remains anchored in the epidermis is called the hair root, while the portion of hair on the skin surface is called the hair shaft. There are three layers of keratinized cells in a hair shaft, the cuticle (surface layer), the cortex (underlying layer) and the medulla (core of the hair).

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What is the most common skin cancer?
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The most common form of skin cancer is basal cell carcinoma , which occurs in the stratum basale layer of the skin and is observed as a waxy bump on the skin surface.

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The fibrous protein that forms the basic structural component of hair and nails is a) collagen. b) melanin. c) elastin. d) keratin.
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Collagen is a fiber located in the reticular layer of the dermis that connects to the papillary layer above the reticular layer and connects to the hypodermis layer underneath. Collagen fibers add protection and limits flexibility in the skin and are not a fibrous protein that forms the basic structure of the hair and nails. The answer is not "a".
Melanin is one of two pigments found in the epidermis. Melanin is a brown, yellow-brown or black pigment produced by melanocytes and is primarily responsible for absorbing UV radiation before it damages nuclear DNA of skin cells in the epidermis. The answer is not "b".
Elastin is a protein found in elastic fibers. Elastic fibers are present in the reticular layer of the dermis and functions to increase flexibility in the skin. The answer is not "c"
Keratin is a protein that is extremely durable, water-resistant and covers the entire epidermal layer of the human body. Keratin also forms the basic structural componentd of the hair and nails. The answer is " d ".

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The two types of exocrine glands in the skin are a) merocrine and sweat glands. B) sebaceous and sweat glands. C) apocrine and sweat glands. D) eccrine and sweat glands.
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Name the two pigments in the epidermis.
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Explain the relationship between sunlight exposure and vitamin D 3 synthesis.
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Describe the hypodermis.
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List five major functions of the integumentary system.
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What happens when the arrector pili muscle contracts?
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The two major components of the integument are a) the cutaneous membrane and the accessory structures. B) the epidermis and the hypodermis. C) the hair and the nails. D) the dermis and the subcutaneous layer.
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Where are the capillaries that supply the epidermis located?
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Dandruff is caused by excessive shedding of cells from the outer layer of skin in the scalp. Thus, dandruff is composed of cells from which epidermal layer?
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Why does exposure to sunlight or sunlamps darken skin?
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List the two terms for the tissue that connects the dermis to underlying tissues.
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Why does the skin of a light-skinned person appear red during exercise in hot weather?
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Match each item in column A with the most closely related item in column B. Place letters for answers in the spaces provided. img
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Identify the different portions a-d) of the cutaneous membrane and the underlying layer of loose connective tissue e) in the following diagram. img a) __________ b) __________ c) __________ d) __________ e) __________
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Some criminals sand their fingertips to avoid leaving recognizable fingerprints. Would this practice permanently remove fingerprints? Why or why not?
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Identify the five layers of the epidermis.
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Describe the location of the dermis.
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