Integumentary System

The Integumentary System Basic Structure of the Skin 1. Complete the following statements by writing the appropriate word or phrase on the correspondingly numbered blank: Epidermis The two basic tissues of which the skin is composed are dense irregular 1. _____________________________ connective tissue, which makes up the dermis, and 1 , which forms the epiKeratin dermis. The tough water-repellent protein found in the epidermal cells is called 2. ____________________________ 2 . The pigments melanin and 3 contribute to skin color. A localized Carotene concentration of melanin is referred to as a 4 . 3. _____________________________ Freckle 4. _____________________________ 2. Four protective functions of the skin are a. b. Protection ____________________________________________ Temperature regulation ____________________________________________ c. d. Prevents water loss _________________________________________ minor excretory system _________________________________________ 3.Using t he key choices, choose all responses that apply to the following descriptions. Key: a. b. c. stratum basale stratum corneum stratum granulosum d. e. f. Stratum Lucidum Stratum corneum & stratum lucidum papillary layer dermis as a whole epidermis as a whole stratum basale stratum corneum stratum spinosum dermis as a whole stratum basale stratum basale papillary layer stratum lucidum stratum spinosum papillary layer g. reticular layer h. epidermis as a whole i. dermis as a whole 1. translucent cells in thick skin containing keratin fibrils 2. dead cells 3. ermal layer responsible for fingerprints 4. vascular region 5. major skin area that produces derivatives (nails and hair) 6. epidermal region exhibiting the most rapid cell division 7. scalelike dead cells, full of keratin, that constantly slough off 8. mitotic cells filled with intermediate filaments 9. has abundant elastic and collagenic fibers 10. location of melanocytes and Merkel cells 11. area where weblike pre-keratin filamen ts first appear 12. region of areolar connective tissue 45 4. Label the skin structures and areas indicated in the accompanying diagram of thin skin.Then, complete the statements that follow. Hair Shaft Stratum Corneum Stratum granulosum Stratum Spinosum Epidermis Layers Stratum Basale nerve endings hair follicle Sebaceous gland Melanocytes Arrector pili muscle Dermis Reticular layer Sweat gland Blood vessel Subcutaneous tissue or Hair Root Hypodermis Vein Adipose cells Pacinian Corpuscle (deep pressure receptor) a. Lamellated granules extruded from the keratinocytes prevent water loss by diffusion through the epidermis. b. c. Glands that respond to rising androgen levels are the sebaceous & apocrine lands. d. Phagocytic cells that occupy the epidermis are called langerhans cells . e. A unique touch receptor formed from a stratum basale cell and a nerve fiber is a merkel disc f. What layer is present in thick skin but not in thin skin? stratum lucidum g. 46 Fibers in the dermis are produced by fibroblasts What cell-to-cell structures hold the cells of the stratum spinosum tightly together? demosomes Review Sheet 7 . . 5. What substance is manufactured in the skin that plays a role in calcium absorption elsewhere in the body? Vitamin D 6.List the sensory receptors found in the dermis of the skin. free nerve endings, messiners corpuscles, pacinian corpuscles 7. A nurse tells a doctor that a patient is cyanotic. Define cyanosis. What does its presence imply? tissues near the skin surface are low on oxygen 8. What is a bedsore (decubitus ulcer)? Why does it occur? blue or purple color to the skin or mucous membranes localized area of tissue necrosis increased pressure over bony areas restrict blood supply to the area Accessory Organs of the Skin 9. Match the key choices with the appropriate descriptions. Key: a. . c. arrector pili cutaneous receptors hair sebaceous glands arrector pili sweat gland-apocrine hair follicle sweat gland-apocrine sebaceous glands hair & nail cutaneous receptors sebaceous glands nail d. e. f. hair follicle nail sebaceous glands g. h. sweat gland—apocrine sweat gland—eccrine 1. produces an accumulation of oily material that is known as a blackhead 2. tiny muscles, attached to hair follicles, that pull the hair upright during fright or cold 3. perspiration glands with a role in temperature control 4. sheath formed of both epithelial and connective tissues . less numerous type of perspiration-producing gland; found mainly in the pubic and axillary regions 6. found everywhere on the body except the palms of hands and soles of feet 7. primarily dead/keratinized cells 8. specialized nerve endings that respond to temperature, touch, etc. 9. secretes a lubricant for hair and skin 10. â€Å"sports† a lunula and a cuticle Review Sheet 7 47 10. Describe two integumentary system mechanisms that help in regulating body temperature. sweat glands- perspiration helps to reduce heat from the skins surface.Arter ioles dilate the skin, then the capillary network of the dermis becomes engorged with the heated blood, then heat is allowed to radiate from the skin surface. 11. Several structures or skin regions are listed below. Identify each by matching its letter with the appropriate area on the figure. C a. adipose cells b. dermis c. epidermis d. hair follicle e. hair shaft f. sloughing stratum corneum cells F E B D A Plotting the Distribution of Sweat Glands 12. With what substance in the bond paper does the iodine painted on the skin react? starch 13.Based on class data, which skin area—the forearm or palm of hand—has more sweat glands? Palm Was this an expected result? ______ Explain. Which other body areas would, if tested, prove to have a high density of sweat glands? 14. What organ system controls the activity of the eccrine sweat glands? soles of the fee, forehead nervous system Dermography: Fingerprinting 15. Why can fingerprints be used to identify individuals? epiderma l ridges found on your fingers are unique and unchanging throughout your lifetime. 16. Name the three common fingerprint patterns. Arches 48 Review Sheet 7 , Loops , and Whorls Integumentary System