Chapter 6 Skin

Chapter 6 Skin - Chapter 6: Page 171 INTEGUMENTARY SYSTEM...

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Chapter 6: INTEGUMENTARY SYSTEM Page 171 1. List the general functions of the skin. a. Protective covering; prevents harmful microorganisms and substances from entering the body; retards water loss by diffusion from deeper tissues and helps regulate temperature; excretes small amounts of waste; houses sensory receptors. 2. Name the tissue in the outer layer of the skin. a. Epidermis – outer layer composed of stratified squamous epithelium 3. Name the tissues in the inner layer of the skin. a. Dermis – thicker than epidermis, made up of connective tissue containing collagen and elastic fibers. 4. Name the tissues in the subcutaneous layer beneath the skin . a. Collagenous and elastic fibers make up the hypodermis - Connective and adipose tissue. Page 176 1. Explain how the epidermis is formed. a. Stratified squamous epithelium – lacks blood vessels. Stratum basale (deepest layer of the of epidermal tissues) is close to the dermis and is nourished by dermal blood vessels, which enables them to divide and grow. b. New cells enlarge and push older epidermal cells away from the dermis toward the surface of the skin. The farther the cells are moved, the poorer their nutrient supply becomes and then they die. 2. Distinguish between the stratum basale and the stratum corneum. a. Basale is the deepest layer of epidermal tissue that is close to the dermis; Corneum is the outermost layer made of tightly packed dead cells. 3. what is the function of melanin. a. Melanin – dark pigment that provides skin color; absorbs UV rays to prevent mutations in the DNA of skin cells and other damaging effects.
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Page 176 1. What kinds of tissues make up the dermis? a. Smooth muscle fibers aid in contraction of the testes; or skeletal muscle fibers anchor the skin and help produce voluntary movement. b. Nerve cells carry impulses to dermal muscles and glands c. Also contains: blood vessels, hair follicles, sebaceous glands and sweat glands. 2. What are the functions of these tissues? a. Smooth muscle fibers aid in contraction of the testes; or skeletal muscle fibers anchor the skin and help produce voluntary movement. b. Nerve cells carry impulses to dermal muscles and glands c. Also contains: blood vessels, hair follicles, sebaceous glands and sweat glands. Page 180 1. Explain how hair forms. a.
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This note was uploaded on 02/12/2009 for the course SCI 1234 taught by Professor Mrs.thomas during the Spring '09 term at Hinds CC.

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Chapter 6 Skin - Chapter 6: Page 171 INTEGUMENTARY SYSTEM...

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