Which of the following statements about T cells is correct?
T cells are involved in the production of antibodies.
T cells directly attack and kill infected cells.
T cells are responsible for phagocytosis of pathogens.
T cells primarily mediate allergic reactions.
The Correct Answer is B
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.
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Related Questions
Correct Answer is C
Explanation
Explanation: The human papillomavirus (HPV) vaccine is recommended for adolescents to protect against certain types of HPV infections, which can lead to cervical, vaginal, vulvar, penile, anal, and throat cancers.
Incorrect choices:
a. The hepatitis B vaccine is typically given in infancy and does not protect against certain types of cancer.
b. The influenza vaccine is recommended annually for people of all ages to prevent the flu, not certain types of cancer.
d. The meningococcal vaccine protects against meningococcal infections, not certain types of cancer.
Conclusion xx
Correct Answer is B
Explanation
Explanation: Fibromyalgia is a chronic pain disorder characterized by widespread pain, fatigue, and tender points in specific areas of the body, such as the neck, shoulders, back, and hips.
Incorrect choices:
a. Systemic lupus erythematosus (SLE) is an autoimmune disorder that can affect multiple organs and systems, including the skin, joints, kidneys, and nervous system.
c. Multiple sclerosis (MS) is an autoimmune disorder that affects the central nervous system, causing symptoms such as fatigue, muscle weakness, and coordination problems.
d. Sjögren's syndrome is an autoimmune disorder that primarily affects the salivary and lacrimal glands, leading to dry eyes and dry mouth.
True or False: Immune disorders can be caused by both genetic and environmental factors.
Explanation: Immune disorders can result from a combination of genetic predisposition and environmental triggers. Some individuals may have a genetic susceptibility to developing certain immune disorders, and exposure to certain environmental factors, such as infections or certain substances, can trigger the immune response leading to the development of the disorder.
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