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science review (HOMEOSTASIS (These 3 major topics are interrelated to help…

- - - - Function and structure are related, because of a certain structure a living thing make contain makes the object function the way it does
      - • One structure can have multiple functions.
  - - - Your body systems are divided into different parts.
      - • Each part has its own special function.
      - • This is called a Division of Labor.
  - - - All the body systems work together to maintain homeostasis.
      - • All the body systems rely on each other in order to function correctly
      - • If one system fails to work, every system will be affected.
      - • This shows the interdependence of all the systems.
- - - - Slow down water loss from deeper tissues
      - House sensory receptors
      - Provide a protecting covering
      - Synthesize various biochemicals
      - Maintain Homeostasis
      - Excrete small quantities of waste
    - - Dermis (inner layes)
        
        Nerve cells processes, hair follicles, sebaceous glands and sweat glands are scattered throughout
        
        Dermal blood vessels supply nutrients to al skin cells
        
        Thicker than the epidermis
        
        Basement membrane anchors the epidermis to the dermis and separates the 2 layes
      - Hypodermis/Subcutaneous Layer
      - Epidermis (outer layer)
        
        Lacks blood vessels
        
        5 Layers of the Epidermis
        
        Stratum Granulosum - mature cells
        
        Stratum Spinosum - maturing cells
        
        Stratum Lucidum - dying; not in all body skin
        
        Stratum Basale/Basement Membrane (innermost) - new cells
        
        Stratum Corneum (uppermost)-dead cell layer
        
        Informations
        
        Stratum Lucidum is the thickened skin of the palm and soles
        
        Cell division increases where skin is rubbed or pressed regularly
        
        Most body areas only have 4 layers (corneum, granulosum, spinosum, basale)
    - - Dark pigment that provides skin color
      - Absorbs UV radiation in sunlight, preventing mutations in DNA of skin cells and other damaging effects.
    - - Due largely to melanin
      - More melanin = darker skin
      - Enviromental and physicological factors also afect skin color