Immunology Chapter: Host Reaction to Foreign Substances

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What is the primary function of the immune system in defending the body against infection?

To maintain the skin at pH of 5.6

To produce earwax

To recognize and respond to foreign antigen (correct)

To attack normal cells

What is the result of the body's natural defense system failing to distinguish between self and non-self cells?

Autoimmune disease (correct)

Hypersensitivity reaction

Innate immunity

Adaptive immunity

Which type of white blood cell is primarily involved in combating parasitic infections?

Neutrophils

Eosinophils (correct)

Basophils

Monocytes

What is the primary function of the external defense system in immunology?

To provide a physical barrier against infection Signup and view all the answers

Which of the following is NOT a characteristic of innate immunity?

Requires prior exposure to an antigen Signup and view all the answers

What is the role of lysosomes in the internal defense system?

To attack cell walls of microorganisms Signup and view all the answers

Which of the following types of cells is responsible for phagocytosis in the nervous system?

Microglia Signup and view all the answers

What is the primary function of antibodies in the immune response?

To activate complements for phagocytosis Signup and view all the answers

Which immunoglobulin is the predominant antibody in secondary or anamnestic immune responses?

IgG Signup and view all the answers

What is the primary function of IgD?

To differentiate into T and B cells Signup and view all the answers

Which of the following cells is responsible for phagocytosis in the liver?

Kupffer cells Signup and view all the answers

What is the function of IgM?

To respond to primary infection Signup and view all the answers

What is the primary function of Protein A in Staphylococcus aureus?

Preventing compliment activation in phagocytosis Signup and view all the answers

What is the primary habitat of Escherichia coli?

Large intestines Signup and view all the answers

What is the function of Staphylokinase in Staphylococcus aureus?

Dissolving fibrin clots Signup and view all the answers

What is the primary mode of transmission of MRSA in a community setting?

Direct contact with an infected person Signup and view all the answers

What is the primary reason for the emergence of MRSA?

Overuse of antibiotics Signup and view all the answers

What is the function of Coagulase in Staphylococcus aureus?

Promoting the formation of fibrin layer Signup and view all the answers