Which class of antibodies is directly involved in the development of allergic reactions?
Immunoglobulin G
Immunoglobulin M
Immunoglobulin E
Immunoglobulin A
The Correct Answer is C
A. Immunoglobulin G (IgG) is the most abundant antibody in the blood and plays a key role in the body's defense against bacterial and viral infections, but it is not directly involved in allergic reactions.
B. Immunoglobulin M (IgM) is the first antibody produced during an initial immune response, primarily involved in fighting infections, but it does not play a major role in allergic reactions.
C. Immunoglobulin E (IgE) is the antibody most directly involved in allergic reactions. When IgE binds to allergens, it triggers the release of histamine from mast cells, leading to the symptoms of allergies.
D. Immunoglobulin A (IgA) is primarily found in mucosal areas such as the respiratory and gastrointestinal tracts, where it helps prevent infections, but it is not directly involved in allergic responses.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Lacrimal glands produce tears and are not involved in the formation of blackheads.
B. Sebaceous glands secrete sebum, an oily substance that can clog hair follicles when produced in excess. This blockage, combined with oxidation, leads to the formation of blackheads on the skin.
C. Sweat glands produce sweat and are not involved in the formation of blackheads, which result from excess sebum and not sweat.
D. Ceruminous glands secrete earwax (cerumen) and are not involved in blackhead formation, as they are located in the ear canal and not on the skin's surface.
Correct Answer is B
Explanation
A. The trachea is the windpipe that carries air to the lungs. While it plays a role in respiration, it does not protect the airway during swallowing.
B. The epiglottis is a flap of cartilage that covers the trachea during swallowing, preventing food or liquid from entering the airway and directing it to the esophagus.
C. The uvula is part of the soft palate that helps in the swallowing process but does not directly protect the airway. It assists in preventing food from entering the nasal cavity.
D. The pharynx is the passageway for both air and food, but it does not provide protection to the airway during swallowing. The epiglottis is the main structure responsible for this protection.
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