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INTEGUMENTARY SYSTEM

INTEGUMENTARY SYSTEM. SKIN Coloring Book Assignment. SKIN: The Organ. Thin, but Tough……. Thinnest portion is over the EYES 1/50 inch thick Thickest portion is on the BACK and SHOULDERS 1/5 inch thick. FUNCTIONS. Barrier to Infection Touch Sensation Body Temperature Excretion

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INTEGUMENTARY SYSTEM

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  1. INTEGUMENTARY SYSTEM SKIN Coloring Book Assignment

  2. SKIN: The Organ Thin, but Tough……. Thinnest portion is over the EYES 1/50 inch thick Thickest portion is on the BACK and SHOULDERS 1/5 inch thick

  3. FUNCTIONS • Barrier to Infection • Touch Sensation • Body Temperature • Excretion • Vitamin D

  4. BASIC STRUCTURES • Skin and Appendages • Glands, nails and hair

  5. 2 LAYERS • EPIDERMIS: dense outer portion, stratified squamousepith. • DERMIS: dense irregular connective, the deep layer

  6. BLISTERS • A separation between the dermis and epidermis.

  7. HYPODERMIS • Loose Connective Tissue • Below the Dermis • Connects the dermis to muscle or bone. (So its not considered part of the skin.)

  8. Layers of the Dermis PAPILLARY leather dermal papillae (bumps) increase the amt of blood vessels exposure to the epidermis. RETICULAR reti=net

  9. Epidermal Ridges Formed from ridges on the epidermis Form fingerprints Increase friction between the skin and the things we touch.

  10. Epidermal Ridges are just lines of Dermal papillae.

  11. Reticular Layer • Network of fibers • The collagen fibers run in all directions providing strength in all directions • However, they tend to lie in one direction more than another…… • Lines of Cleavage or Lines of Tension

  12. NERVES • Send signals to and receive signals from the brain and spinal cord • Numerous in the skin. • Hair follicle receptors • Nerves wrapped around hair in the dermis

  13. Hair Follicle • Made of epithelial tissue… same as the epidermis. • BURNS • 1st • 2nd • 3rd

  14. ArrectorPili • Muscle cells associated with the hair • When the arrectorpili contracts the hairs stand on end. • goose bumps

  15. HYPODERMIS • Subcutaneous tissue • Loose connective tissue and adipose tissue • Loose ct connects the skin to muscle or bone • Adipose provides cushion and insulation • Lots of blood vessels

  16. Blood Vessel Loops • Found in the dermal papillae • Increase surface area for nutrients uptake

  17. GLANDS • Sweat: Sweat ducts and sweat pores • Secretion= sweat • Ducts lead to surface of skin • Cools the skin • Sebaceous: produce oils to soften skin and protect from bacteria.

  18. A master criminal finds a doctor who has developed a procedure to remove the dermal papillae in a person’s hands. Why would a criminal be so interested in this procedure?

  19. The criminal from the previous question undergoes the unscrupulous doctor’s procedure and finds that he has constant skin problems in his hands. Why?

  20. In a fencing accident, a man receives two similarly sized deep cuts on the skin in the region of his abdomen. The first is horizontal along the skin, while the other is vertical. Which cut, most likely will leave the most noticeable scar? • See Figure 3-2 page 63

  21. The Layers of the Epidermis Dead keratinocytes Stratum corneum Stratum Lucidum Stratum Granulosum Living keratinocytes Stratum Spinosum Merkel Cell Melanocyte Stratum Basale Nerve Receptor

  22. Cancer results from the uncontrolled mitosis of a group of cells. In what layers of the epidermis is it possible to get cancer? Why is it impossible to get cancer in the other layers of the epidermis?

  23. Jaundice

  24. Cyanosis

  25. Hair Hair Shaft Sweat Gland Sebaceous Gland ArrectorPili Muscle Hair Receptor Nerves Hair Follicle Hair Root Hair Bulb Dermal Papillae Blood Vessels

  26. Dermal root sheath melanocytes Stratum basal

  27. Hair Growth • One-half inch a month. • Growth Stages: hair follicles have times which the cells of the matrix reproduce a lot. • Rest Stages: times when the cells of the matrix do not reproduce much • Hair Follicles have different growth and rest stages. (amount of time in each stage)

  28. Free edge Lunule Fold Root Nail Body MATRIX

  29. http://www.mhhe.com/biosci/ap/saladin2e/student_index.mhtml http://highered.mcgraw-hill.com/sites/0072351187/student_view0/

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