Podcast
Questions and Answers
Which of the following is an example of a chemical barrier to infection?
Which of the following is an example of a chemical barrier to infection?
What is the function of lysozyme in the immune system?
What is the function of lysozyme in the immune system?
What is the role of mucous membranes in the immune system?
What is the role of mucous membranes in the immune system?
Intact skin is a mechanical barrier to infection.
Intact skin is a mechanical barrier to infection.
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Lactoferrin is found in tears and saliva.
Lactoferrin is found in tears and saliva.
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Peristaltic movement of the intestines is an example of a chemical barrier to infection.
Peristaltic movement of the intestines is an example of a chemical barrier to infection.
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Study Notes
Chemical Barriers to Infection
- Chemical barriers include substances that inhibit microbial growth or kill pathogens.
- Lysozyme is an example, found in various bodily secretions such as tears and saliva, which breaks down bacterial cell walls.
Lysozyme Function
- Lysozyme's primary function is to enzymatically target and destroy bacteria, aiding in the immune response.
- It contributes to the creation of a hostile environment for pathogens at mucosal surfaces.
Role of Mucous Membranes
- Mucous membranes trap pathogens and particulates, preventing their entry into the body.
- They secrete mucus, which contains antimicrobial substances that help neutralize infections.
Intact Skin as a Barrier
- Intact skin forms a strong mechanical barrier that protects against pathogen penetration and infection.
- It provides the first line of defense by physically blocking entry points.
Lactoferrin Presence
- Lactoferrin is an iron-binding protein present in tears and saliva, which deprives bacteria of iron necessary for their growth.
- This function enhances the body’s ability to combat infections by limiting microbial replication.
Peristaltic Movement
- Peristaltic movement refers to the coordinated contractions of intestinal muscles, aiding in the movement of food.
- It is not a chemical barrier; instead, it mechanically helps eliminate pathogens from the gastrointestinal tract.
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Description
Test your knowledge on the structural, mechanical, and chemical barriers that the human body employs to defend against pathogens and foreign invaders.
