Presentation on theme: "The Integumentary System"— Presentation transcript:
1 The Integumentary System Section 32.1The Integumentary System
2 32.1 The Integumentary System The Structure of the SkinMultilayered organCovers and protects the body.
3 The Epidermis Outer, superficial layer of skin The outer layers contain keratinWaterproofsProtects cells and tissues that lie underneath.
4 The Epidermis, continued… Inner layer contains cells that continually divide to replace cells that are lost or die.Some cells in the inner layer provide protection from harmful UV radiation by making a pigment called melanin.
5 The Dermis connective tissue nerve cells muscle fibers Directly beneath the epidermis is the dermis.Consists of:connective tissuenerve cellsmuscle fibersSweat, oil glandshair folliclesBelow is the subcutaneous layer, a layer of connective tissue that stores fat and helps the body retain heat.
6 Hair and Nails Both contain keratin, develop from epithelial cells. Grow out of narrow cavities in the dermis called hair follicles.Follicles usually have sebaceous glands that lubricate the skin and hair.
7 Functions of the Integumentary System Temperature regulationVitamin productionProtection and senses
8 Damage to the Skin Skin has remarkable abilities to repair itself. Without a repair mechanism, the body would be subject to invasion by microbes through breaks in the skin.
9 Cuts and ScrapesCells deep in the epidermis divide and replace the lost or injured cells.When the injury is deep, blood vessels might be injured, resulting in bleeding.Infection-fighting white blood cells will help get rid of any bacteria that might have entered the wound.
13 Skin CancerUV radiation can damage the DNA in skin cells, causing those cells to grow and divide uncontrollably.Two main categories of skin cancer: melanoma and nonmelanoma.
14 32.1 Formative Questions What protective protein is contained in the outer layers of epidermal cells?collagenkeratinfibrinogenmelanin
15 32.1 Formative QuestionsHow do cells in the skin protect the skin fromultraviolet radiation?They secrete oils.They store cutin.They absorb calcium.They produce melanin.
16 32.1 Formative Questions Where are sebaceous glands located? dermis hair folliclessweat poressubcutaneous tissue
17 32.1 Formative Questions For which type of burn is there usually no pain?first-degreesecond-degreethird-degree
18 32.1 Formative Questions Why is exposure to ultraviolet radiation a significant risk factor for the developmentof skin cancer?It damages the DNA in skin cells.It causes excess vitamin D production.It mutates melanin molecules in the skin.It causes irregular freckles and moles toappear.
19 What might result from a blocked sebaceous gland? acne sweat baldness Chapter 32Integumentary, Skeletal, and Muscular SystemsChapter Assessment QuestionsWhat might resultfrom a blockedsebaceous gland?acnesweatbaldnessingrown hair
20 Which structure causes goose bumps? Chapter 32Integumentary, Skeletal, and Muscular SystemsChapter Assessment QuestionsWhich structure causes goose bumps?nervesfatsweat glandsmuscles
21 Describe how a cut on the skin heals. Chapter 32Integumentary, Skeletal, and Muscular SystemsChapter Assessment QuestionsDescribe how a cut on the skin heals.Answer: Blood flows out of the skin andforms a clot and scab. Under thescab, cells multiply to fill the wound.Infection-fighting white blood cellsget rid of bacteria.
22 What is this bump in the skin? a mole a wart a goosebump Chapter 32Integumentary, Skeletal, and Muscular SystemsStandardized Test PracticeWhat is this bumpin the skin?a molea warta goosebumpan acne pimple
23 What protein do hair and nails contain? Chapter 32Integumentary, Skeletal, and Muscular SystemsStandardized Test PracticeWhat protein do hair and nails contain?chitincutinkeratinmyosin