8 Questions
What is the role of stomach acid in the immune system?
Destroy pathogens that are swallowed
What is the function of the first line of defence in our immune system?
Prevents pathogens from entering the body
In the context of the immune system, what is the function of phagocytes?
Engulf and digest bacteria and viruses
Which cells are responsible for engulfing and destroying pathogens in a process called phagocytosis?
White blood cells
What is the main function of lymphocytes in the immune system?
Produce antibodies to fight infections
What is the main function of antibodies produced by the third line of defence in the immune system?
Attacking specific pathogens and defending against them
How do antibodies contribute to the immune response?
Stop pathogens from moving through the body
How do chemical barriers like stomach acid contribute to our immune system's defence against pathogens?
By directly attacking pathogens in food we consume
Study Notes
Immune System Defence
- Stomach acid plays a crucial role in the immune system by killing ingested pathogens, preventing them from entering the bloodstream and causing infection.
First Line of Defence
- The first line of defence in the immune system provides an immediate barrier against infection, preventing pathogens from entering the body in the first place.
Phagocytes
- Phagocytes are a type of immune cell that engulfs and destroys pathogens, playing a vital role in the defence against infection.
Phagocytosis
- Phagocytosis is the process by which cells, such as neutrophils and macrophages, engulf and destroy pathogens, eliminating them from the body.
Lymphocytes
- The main function of lymphocytes in the immune system is to recognise and respond to specific pathogens, providing long-term immunity against future infections.
Antibodies
- Antibodies produced by the third line of defence in the immune system recognise and bind to specific pathogens, marking them for destruction and preventing them from causing infection.
- Antibodies contribute to the immune response by neutralising pathogens, preventing them from entering host cells and causing infection.
Chemical Barriers
- Chemical barriers, such as stomach acid, contribute to the immune system's defence against pathogens by creating an environment that is hostile to their survival and growth.
Test your knowledge of the body's defense mechanisms against pathogens. This quiz covers topics such as the role of mucus, stomach acid, barriers to entry, blood cell defenses, and phagocytosis.
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