116 UNIT 7 | The Integumentary System Activity 2: Examining the Histology of the
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Question
116 UNIT 7 | The Integumentary System Activity 2: Examining the Histology of the Skin 1. The narrow epidermal layer that appears clear is the: a. stratum granulosum. b. stratum corneum. c. stratum basale. d. stratum spinosum. e stratum lucidum. 2. Which epidermal stratum is missing in thin skin? a, stratum corneum b. stratum basale c. stratum lucidum d. stratum spinosum e. stratum granulosum 3. True or false?: Unlike a suntan, which is lost because of constant renewal of keratinocytes, a tattoo is usually permanent because the pigments are in the dermis, which does not have significant cell turnover a. true b. false Activity 3: Determining Sweat Gland Distribution 1. True or falset: Eccrine sweat glands are located in the skin of the palm and forehead, but not in the forearm. a. true b. false PART II. Putting It All Together A. Review Questions Answer the following questions using your lecture notes, your textbook, and your lab notes: 1. For each skin structure, write one of its functions and the skin layer in which it is found. a. hair matrix b. dendritic cell c keratinocyte d. collagen fibers e. dermal papillae f stratum basaleExplanation / Answer
1. e. stratum lucidum
2. c.stratum lucidum(present only in thick skin)
3. True(needle inject ink into dermis)
Activity 3
1. True
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a.hair matrix:present around hair follicle.hair matrix produces hair
b.dendritic cells:antigen presenting cells.in all layer of skin.mainly in stratum spinosum
c.keratinocyte:present in basal layer.it maintains various stages of differentiation in epidermis and responsible for forming tight junctions with nerves of skin
d.collagen fibers:provides strength and cushioning to many areas of body.present in reticular dermis.
e. dermal papillae:present in reticular dermis.
f.stratum basale:deepest layer of epidermis.this basal cell continuous divides and new cells constantly push older ones up towords the surface of skin,where they eventually shed.
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