The Integumentary System: Structure and Functions of the Skin, Summaries of Chemistry

Download The Integumentary System: Structure and Functions of the Skin and more Summaries Chemistry in PDF only on Docsity! NAME LAB TIME/DATE COURSE/YEAR/SECTION SS TEACHER Exercise 4 The Integumentary System I. Basic Structure of the Skin 1. Complete the following statements by writing the appropriate word or phrase on the correspondingly numbered blank: The two basic tissues of which the skin is composed are dense irregular connective tissue, which makes up the dermis, and a.) ____, which forms the epidermis. The tough water-repellent protein found in the epidermal cells is called b.) ____.. The pigments melanin and c.)____contribute to skin color. A localized concentration of melanin is referred to as a d. c. carotene Answers: a. stratified squamous epithelium 4 P d. freckle b. keratin 2. Four protective functions of the skin are: a. _Prevents dessication __ c. prevents bacterial invasion b. _protects against thermal damage d. protects against UV radiation 3. Using the key choices, choose all responses that apply to the following descriptions. Key: a. stratum basale d. stratum lucidum g. reticular layer b. stratum corneum e. stratum spinosum h. epidermis as a whole c. stratum granulosum f. papillary layer i. dermis as a whole d; stratum lucidum 1. translucent cells in thick skin containing keratin fibrils b &d; strata corneum and lucidum 2. dead cells f; papillary layer 3. dermis layer responsible for fingerprints i; dermis (or f, g)4. vascular region h; epidermis 5. major skin area that produces derivatives (nails and hair) a; stratum basale 6. epidermal region exhibiting the most rapid cell division b; stratum corneum 7. scalelike dead cells, full of keratin, that constantly slough off e; stratum spinosum___8. mitotic cells filled with intermediate filaments i; dermis (org) _9. has abundant elastic and collagenic fibers a; stratum basale 10. location of melanocytes and Merkel cells e; stratum spinosum__11. area where weblike prekeratin filaments first appear f; papillary layer 12. region of areolar connective tissue 4. Label the skin structures and areas indicated in the accompanying diagram of thin skin. Then, complete the statements that follow. Dermis Subcutaneous tissue or Aypodermis Hair shaft Stratum cornenin Stratum granulosum Stratum Spinosum Stratum Pasale (layers) Dermal papillae Hair root 1 Sebaceous gland Hair follicle Arrector pili muscle Reticular layer _ Sweat gland [——— Blood vessel Hair bulh Nerve fiber Adipose calls Laminated (or lamellated a. granules extruded from the keratinocytes prevent water loss by diffusion through the epidermis fibroblasts b. Fibers in the dermis are produced by. . sebaceous (and apocrine sweat)c. Glands that respond to rising androgen levels are the glands. Langerhans’ cells _d. Phagocytic cells that occupy the epidermis are called__. Merkel disc fiber is called Desmosomes e. A unique touch receptor formed from a stratum basale cell and a nerve Stratum lucidum __f. What layer is present in thick skin but not in thin skin? g. What cell-to-cell structures hold the cells of the stratum spinosum tightly together?