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Excretory, immune and nervous systems Carolina Elias 8B (Nervous System…

- - - - Sympathetic: stress reactions
      - Parasympathetic: relaxation reactions
- - - - Kidney: filters blood (removes urea, removes water and salts, regulates blood pressure, volume and pH)
      - Ureter: urine passes through it to go to the bladder.
      - Bladder: stores urine
      - Urethra: connects bladder with the outside, removes urine from the body.
      - Ureter: urine passes through it to go to the bladder.
    - - Filtration
      - Reabsorption
      - Concentration
      - Secretion
- - - - Forms a protection surface
      - Releases substances that kill attackers
    - - When you breathe in, you also inhale bacterias, mucus try to block it, so it stays stuck.
      - Cilia, moves the mucus to the throat for coughing or swallowing.
  - - - They eat external particles and break them into lysosomes
    - - Identify infected cells and kill them
      - Search for more cells to kill
    - - When cells are affected, they release histamines
        
        example: capillaries dilate
    - - Give viruses the ability of attack other viruses.
  - - - Infections rarely make it until here
      - Cause release of antibodies
    - - WBCs collect mean particles and break them up
      - Show them to T-cells, that identifies the pieces and find certain B-cells to produce antibodies
  - - - Active:
        
        You produce the defense
        
        Vaccine:
        
        You insert an ideal amount of antigens, and then your body develops immunity
        
        Duration
        
        Each antigen has an specific duration
      - Passive
        
        You don't produce it
        
        You receive from your mother when she is pregnant
      - Allergies:
        
        Immune disorder
        
        Your body identifies external items as harmful things.