Human defence systems

• What does skin do

  Its produces antimicrobial substance (sebum) to inhibit growth of pathogens
• What is the largest organ

  Skin
• What do noses do

  Full of hair and mucus which trap microbes until you either blow out or swallow them
• What do ears do

  yellow sticky earwax traps microbes
• What do cilia do

  Mucus traps microbes and ciliated epithelial cells waft it to the back of your throat so you swallow it
• What do eyes do

  tears and rapid eye movement (REM) kill microbes and push microbes to the front of the eye
• What does blood clotting do

  Prevents infections
• What does the stomach do

  Microbes ingested in food enter the stomach containing HCL (ph2) which kill most of them
• What do the intestine + anus do

  Intestines-good gut bacteria outcome the bad ones

  Anus-most microbes are ejected from the anus with feces