Science - Second line of defence
Updated: 5/22/2020
Science - Second line of defence
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Storyboard Text

  • The role of the immune system is to protect you against foreign bodies by physically stopping them from entering your body, and then identifying and attacking them if they do manage to enter.
  • There are three lines of defence against disease, each with a different role. But today we will focus on the second line of defence.
  • The second line of defence only occurs if a pathogen manages to get inside our body, a general ‘seek and destroy’ approach is taken, regardless of the type or structure of the pathogen. Some non-specific immune responses include: inflammation, fever and phagocytosis
  • Fever is part of the second line of defence. Fever is an increase in core body temperature above 38 degrees celsius. Fever is normally accompanied by shivering and sweating. A high temperature slows down or can even kill some of the pathogens that entered the body. This helps the immune system deal with the threat.
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  • Inflammation is also apart of the second line of defence. This is known as the painful redness and swelling around the area of infection. This occurs because more blood is directed to that part of the body. Blood contains white blood cells that are specifically to fight off pathogens
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  • Phagocytes or Phagocytosis is apart of the immune systems second line of defence. This is where some white blood cells destroy anything they don't recognize as part of the body. This is done by a phagocyte enveloping a pathogen, and once inside the phagocyte it is destroyed with enzymes. This helps protect the body for other threats.
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