A&P I Lab Report 6 2021 - Roberto Rodriguez, DHSc, MS, MD Lab: Integumentary System PDF

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Roberto Rodriguez, DHSc, MS, MD
Lab: Integumentary System...

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A&PI

Laboratory Report 6

2021

Lab Assessment 11 – Integumentary System Part A 1. Label the structures indicated in figure 11.5 1. Hair shaft 2. Sweat pore 3. Hair root 4. Sebaceous gland 5. Arrector pili muscle 6. Epidermis 7. Dermis 8. Hypodermis (subcutaneous layer)

2. Match the structures in column A with the description and functions in Column B. Place the letter of your choice in the space provided. __J. sebum___1. An oily secretion that helps to waterproof body surface _L. stratum corneum__2. Outermost layer of epidermis _A. apocrine sweat gland__3. Become active at puberty _H. melanin____4. Epidermal pigments __C. dermis___5. Inner layer of skin _D. eccrine (merocrine) sweat gland__6. Responds to elevated body temperature __E. epidermis___7. General name of entire superficial layer of the skin _I. sebaceous gland____8. Gland that secretes an oily substance _G. keratin____9. Hard protein of nails and hair __K. stratum basale___10. Cell division and deepest layer of epidermis __F. hair follicle___11. Tubelike part that contains the root of the hair

__B. Arrector pili muscle___12. Causes hair to stand on end and goose bumps to appear

Part B 1. How does the skin of your palm differ from that on the back (posterior) of your hand? The palm does not have hair follicles, and it has an extra layer of skin for protection. This skin is called the stratum lucidum. 2. Describe the differences you observed in the type and distribution of hair on the front (anterior) and back (posterior) of your forearm. The front of the forearm has more hair because it has a thicker layer of skin. The back of the forearm has less and thinner layers of skin that the front, so less hair. 3. Explain how a hair is formed. The hair, which grows through a depression from the epidermis, has a hair papilla at the base of the hair which contains a network of capillaries that supply the nutrients for cell divisions for hair growth within the hair bulb. As the cells of the hair are forced toward the surface of the body, they become keratinized and pigmented and die.

Part C 1. Distinguish the locations and tissues among epidermis, dermis, and hypodermis layers The epidermis is the superficial layer composed of stratified squamous epithelium. The dermis is the deep layer of skin composed mostly of irregular dense connective tissue. The subcutaneous layer is beneath the dermis and composed of areolar and adipose. 2. How do the cells of stratum corneum and stratum basale differ? The stratum corneum is the most superficial layer of the epidermis, while the stratum basale layer is the deepest layer of the epidermis. The cells of the corneum are squamousshaped , actually dead, and contain a high percentage of keratin (like that found in nails and hair), while the cells of the basale are cuboidal or columnar shaped , actively mitotic (alive) and have relatively little keratin. 3. State the specific location of melanin observed in dark skin Melanin is found in the stratum basale 4. What special qualities does the connective tissue of the dermis have?

It contains both elastic and collagenous fibers that give the dermis the qualities of elasticity and strength

Part D 1. What part of the hair extends from the hair papilla to the body surface? The hair root 2. In which layer of skin are sebaceous glands found? The dermis 3. How are sebaceous glands associated with hair follicles? The sebaceous glands are connected to the hair follicles and secrete sebum into the follicles 4. In which layer of skin are sweat glands usually located? The dermis...