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Anatomical Barriers and Innate Immunity

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Questions and Answers

What is the primary function of anatomical barriers in the body?

To produce antibodies against pathogens

To recognize and respond to specific pathogens

To prevent the entry of microorganisms into the body (correct)

To coordinate the immune response

Which of the following physiological barriers provides immunity by maintaining a high body temperature?

Birds (correct)

Humans

Infants

All of the above

What is the function of lysozyme in the body?

To cleave bacterial cell walls (correct)

To produce antibodies against pathogens

To recognize and respond to specific pathogens

To coordinate the immune response

Which of the following is an example of a chemical barrier in the body?

Lysozyme Signup and view all the answers

What is the function of acidity in the stomach?

To kill most ingested bacteria Signup and view all the answers

What is the function of nasal hair in the body?

To filter out microbes from dust in the nose Signup and view all the answers

What is the function of histamine in the inflammatory response?

Increases the permeability of blood capillaries Signup and view all the answers

Which type of cell is responsible for recognizing and ingesting foreign substances?

Macrophages Signup and view all the answers

What is the mechanism by which phagocytic cells migrate towards microorganisms?

Chemotaxis Signup and view all the answers

What is the fate of the microorganism after being ingested by a phagocytic cell?

It is digested by hydrolytic enzymes Signup and view all the answers

What is the function of complement proteins in the immune response?

They lyse bacteria, viruses, protozoa, and fungi Signup and view all the answers

What is the outcome of the fusion of phagosome and lysosome?

The formation of phagolysosome and digestion of the microorganism Signup and view all the answers

What is the ability to discriminate among different molecular entities and respond only to those uniquely required responses?

Specificity Signup and view all the answers

Which cells are responsible for processing and presenting antigen to T-cells?

Macrophages and dendritic cells Signup and view all the answers

What is the term for the ability to recognize and respond to molecules that are foreign (non-self) and avoid making a response to those molecules that are self?

Discrimination Signup and view all the answers

Where do T-cell precursors undergo critical maturation steps?

Thymus Signup and view all the answers

What is the property shared with the nervous system that allows the immune system to recall previous contact with a foreign molecule?

Memory Signup and view all the answers

What is the result of antigen-presenting cells processing protein antigens intracellularly?

A constellation of peptides that noncovalently bind to MHC molecules Signup and view all the answers