What is the role of antibodies in the immune response?
Destroying infected cells
Attracting white blood cells to the site of infection
Producing hormones to activate the immune system
Regulating body temperature
The Correct Answer is A
Explanation: Destroying infected cells. Antibodies are produced by B cells in response to a specific pathogen and play a crucial role in identifying and neutralizing the invading pathogens, including infected cells.
Incorrect choices:
b. Attracting white blood cells to the site of infection is not the primary role of antibodies. White blood cells are attracted to the site of infection by chemical signals released by damaged tissues or pathogens.
c. Antibodies do not produce hormones. Hormones are chemical messengers produced by endocrine glands to regulate various bodily functions.
d. Antibodies do not regulate body temperature. Body temperature regulation is mainly controlled by the hypothalamus in the brain.
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Related Questions
Correct Answer is B
Explanation
Correct answer: B
Explanation: T cells, specifically cytotoxic T cells (CD8+ T cells), are responsible for cell-mediated immunity. They directly recognize and attack infected or abnormal cells, leading to their destruction. This process is crucial in controlling viral infections and cancer cells.
Incorrect choices:
a. B cells, not T cells, are responsible for the production of antibodies during the humoral immune response.
c. Phagocytosis of pathogens is mainly carried out by macrophages and neutrophils, not T cells.
d. Allergic reactions are primarily mediated by a different type of T cells called helper T cells (CD4+ T cells), not cytotoxic T cells.
Correct Answer is C
Explanation
Explanation: The pneumococcal polysaccharide vaccine is recommended for older adults to protect against pneumonia caused by Streptococcus pneumoniae bacteria. The influenza vaccine is recommended annually for people of all ages to prevent the flu.
Incorrect choices:
a. The hepatitis B vaccine is not specifically recommended for older adults to prevent pneumonia.
b. The influenza vaccine protects against the flu, not pneumonia.
d. The HPV vaccine is recommended for adolescents and young adults, not older adults, and does not protect against pneumonia.
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