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The integumentary System Adriana Bonilla Period 1 - Coggle Diagram

- - - - Blocks most water and water soluble substances. These are Flat, dead, keratinized cells of stratum corneum, surrounded by glycolip. There is a limit to penetration of skin for some chemicals.
    - - dermis
        
        contains phagocytic cells the engulf foreign substances and show to white blood cells to activate immune system
      - epidermis
        
        contains macrophages which also activate immune system
    - - Skin secretes chemical such as sweat, sebum, & defensins. Melanin provides chemical barrier against UV radiation
- - - - layer is thin with flattened cells 4-6 layers thick. cells above die because they're too far from dermal capillaries. The cell appearance changes
    - - deepest of all layers. contains single row cells that actively divide. firmly attached to dermis.daughter cell travels from basal layer to surface between 25-45 and dies as it reaches the surface
    - - several layers thick. keratinocytes look spikey so they are called prickly cells
    - - only found in thick skin. contains translucent band of 2-3 rows of clear, flat, dead keratinocytes
    - - 20–30 rows of flat, anucleated, keratinized dead cells. The cells are dead, but still protects deeper cells from environment, prevents water loss, Protects from abrasion and penetration, and Act as a barrier against biological, chemical, and physical assaults
  - - - Makes up around 80% of dermal thickness. Consists of coarse, dense fibrous connective tissue. Elastic fiber provides stretch recoil properties and collagen fibers provide strength and resiliency
    - - Superficial layer of areolar connective tissue consisting of loose, interlacing collagen and elastic fibers and blood vessels.
      - Dermal papillae: superficial region of dermis that sends fingerlike projections up into epidermis. Enhances gripping ability, contributes to sense of touch, and sweat pores eave unique finger print
- - - - A:assymetry; the two sides of the pigmented area aren't the same
      - B; border irregularity; exhibits indentations
      - D; diameter: bigger than 6mm (pencil eraser size)
      - C: color; contains many colors like blue, black, tan, brown , and red