Which of the following describes an activity of B cells?
Suppression of the immune response
Manufacture of antibodies
Phagocytosis
Direct destruction of foreign cells
The Correct Answer is B
A. Suppression of the immune response is primarily carried out by regulatory T cells, not B cells.
B. B cells are responsible for the production of antibodies. When activated, they differentiate into plasma cells, which secrete antibodies that target specific antigens (pathogens).
C. Phagocytosis is mainly performed by macrophages and neutrophils, not by B cells.
D. Direct destruction of foreign cells is a function typically carried out by cytotoxic T cells, not B cells.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. The portal of entry is the specific site or pathway through which a pathogen enters the body, such as the skin, mucous membranes, or respiratory and digestive tracts.
B. Blood is not the site of entry but rather a medium that can carry pathogens throughout the body once they have entered through a portal of entry.
C. The respiratory tract is a common portal of entry for many pathogens (like viruses or bacteria), but it is just one example of a portal of entry, not the general term for it.
D. Inflammation is an immune response to infection or injury, not a site of entry for
Correct Answer is B
Explanation
A. Carotid veins are not the primary veins for receiving lymph from lymphatic vessels. Carotid veins are associated with the head and neck, but they are not the main vessels where lymph drains.
B. Subclavian veins are the correct answer. The lymphatic system drains lymph into the subclavian veins at the junction of the internal jugular vein, where the lymphatic ducts (such as the thoracic duct and right lymphatic duct) empty into the bloodstream.
C. Brachial veins are associated with the upper arm and do not receive lymph from the terminal lymphatic vessels.
D. Pulmonary veins are responsible for carrying oxygenated blood from the lungs to the heart, not lymph.
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