1 / 41

integumentary system

. . Keys. Lecture Outline

Mercy
Download Presentation

integumentary system

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Integumentary System Chapter 36 Section 3

    3. Functions Covers and protects the body What does the skin protect us from? Pathogens Injury Ultra-violet radiation

    4. Functions 2. Regulate body temperature How does it regulate temperature? Sweating Dilate/constrict of blood vessels Goose bumps

    5. Functions 3. Excretes Waste What wastes are excreted? Urea as sweat

    6. Functions 4. Reduces water loss Keeps the body from drying out!

    7. Functions 5. Houses sensory receptors

    8. There are 2 main layers of skin

    9. Epidermis Outer (surface) layers of skin 10-30 cells thick Two Parts: Inner part composed of living cells Outer part is of dead cells

    10. Epidermis – Inner layers Lowest layer of cells reproduce and push older cells toward the surface. As cells near the surface, they flatten and their organelle disintegrate

    11. Epidermis – Inner layers These cells also begin producing Keratin a tough, fibrous protein. This replaces cytoplasm.

    12. Epidermis – Outer layers The Keratin producing cells die as they move toward the surface. Outer dead layer waterproofs and protects inner layers It is shed continually and is completely replaced in 2 - 4 weeks

    13. Epidermis What do we find in the epidermis? Melanocytes What are melanocytes? Cells that produce melanin. What is melanin? A dark brown pigment What does melanin do? Gives skin it’s color Protects sensitive dermis from U-V radiation

    14. Epidermis Melanocytes

    15. Epidermis Skin pigmentation is due to the type and amount of melanin produced Eumelanin produces darker pigments Phaeomelanin produces lighter pigments and freckles These often occur together in varying amounts

    16. Dermis Deeper layers of skin 10-20 times thicker than epidermis. Top layer arranged In ridges. Why are there ridges?

    17. Dermis Ridges help the epidermis bind to the dermis. The uneven ridges create fingerprints

    18. Accessory Organs of the Dermis 1. Hair follicles – tube-like depression where the hair develops

    19. Accessory Organs of the Dermis 2. Sebaceous glands – secret oily sebum to soften and waterproof skin

    20. Accessory Organs of the Dermis 3. Nails – protective covers of ends of fingers and toes.

    21. Accessory Organs of the Dermis 4. Sweat glands: secrete waste regulate heat produces ear wax produces milk during lactation

    22. Accessory Organs of the Dermis 5. Blood vessels – to nourish skin cells

    23. Accessory Organs of the Dermis 6. Nerves – to send and receive messages

    24. Accessory Organs of the Dermis 7. Erector pilli muscle -smooth muscle -causes “goosebumps” -causes hair to stand erect

    25. Subcutaneous layer – connective tissue Anchors dermis to the body Contains fat cells to protect and cushion

    27. Disorders of the Skin Acne – infection of sebaceous gland

    28. Disorders of the Skin Benign tumor – fleshy growths on neck, armpits and body. Harmless!

    29. Disorders of the Skin Vascular Birthmarks – Blood vessel abnormality affecting .5% of population – darkens skin

    30. Disorders of the Skin Dermatitis – dry, sensitive skin

    31. Disorders of the Skin Nail Fungus

    32. Disorders of the Skin Fungal infections

    33. Disorders of the Skin Impetigo – bacterial infection

    34. Disorders of the Skin Psoriasis – chronic inflammation

    35. Disorders of the Skin Cancer

    36. Disorders of the Skin Warts- viral infection

    37. Disorders of the Skin

    38. Interesting Tidbits Your body is composed of approximately 100 Trillion cells About 16% of your body weight is skin The skin is completely renewed every 27 days You will make almost 1000 new skins in a lifetime If all the layers of your skin were laid out on the ground, it would cover about 20 m2 or 2 parking spaces

    39. Interesting Tidbits A fingernail or toenail takes about 6 months to grow from base to tip Fingernails grow faster than toenails An average human scalp has 100,000 hairs We lose between 40 and 100 hairs per day Blondes have more hair than brunettes

    40. Interesting Tidbits Fingerprints provide traction for grasping objects Even identical twins have different fingerprints Every square inch of dermis contains twenty feet of blood vessels Skin on our hands and feet is thicker. When we bathe, skin takes on water and swells slightly. In the thicker areas, increased surface area creates crowding. The skin must wrinkle to accommodate the changes

    41. Interesting Tidbits Friction of the epidermis causes cell division to increase. This outward thickening is called a callous. Sometimes growth is inward, creating a corn. Humans shed about 600,000 particles of skin per hour – about 1.5 pounds per year. At age 70, you will have lost about 105 lbs of skin.

More Related