Which of the following is an accurate description of a type-1 hypersensitivity reaction?
Most type-1 reactions are allergic
It is mediated by IgA.
It never contributes to autoimmune diseases.
Most occur against medications
The Correct Answer is A
A. Most type-1 reactions are allergic: This statement is accurate. Type-1 hypersensitivity reactions are typically associated with allergies. When a person is exposed to a specific allergen (like pollen or certain foods), their immune system overreacts, leading to various symptoms, from mild to severe.
B. It is mediated by IgA: This statement is incorrect. Type-1 hypersensitivity reactions are primarily mediated by immunoglobulin E (IgE) antibodies. When these antibodies bind to allergens, they trigger the release of histamine and other chemicals, causing allergic symptoms.
C. It never contributes to autoimmune diseases: This statement is incorrect. While type-1 hypersensitivity reactions are often associated with allergies, they are distinct from autoimmune diseases. In autoimmune diseases, the immune system mistakenly attacks the body's own cells and tissues, which is a different mechanism from hypersensitivity reactions.
D. Most occur against medications: This statement is not entirely accurate. While some type-1 hypersensitivity reactions can be triggered by medications (like penicillin), they can also be caused by various other allergens such as pollen, animal dander, insect venom, and certain foods. The prevalence of medication-induced type-1 reactions varies, and it's not accurate to say that most occur against medications.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Obtaining all cultures before the antibiotic is administered: While obtaining cultures is important for identifying the specific pathogen causing the infection and guiding targeted antibiotic therapy, waiting for culture results can take time. During this time, the infection can progress. Therefore, it's generally recommended to initiate broad-spectrum antibiotics first and then adjust the treatment based on culture results.
B. Delaying administration of the antibiotic until the culture results are available: Delaying antibiotics until culture results are available can be risky, as it allows the infection to progress, potentially leading to sepsis or other severe complications.
C. Administering antipyretics as soon as possible: Administering antipyretics like acetaminophen or ibuprofen can help reduce fever and make the patient more comfortable. However, the primary intervention for a suspected infection is antibiotic therapy, as it targets the underlying cause of the fever.
D. Administering the antibiotic immediately: When dealing with a patient with a fever of unknown origin and a suspected infection, the priority is to start appropriate antibiotic therapy promptly. Delaying antibiotic administration can allow the infection to worsen, leading to serious complications.
Correct Answer is A
Explanation
A. "Tetracycline inhibits protein synthesis."
Explanation: Tetracycline antibiotics interfere with bacterial protein synthesis by binding to the bacterial ribosomes. This binding prevents the attachment of transfer RNA (tRNA) to the messenger RNA (mRNA) complex, effectively inhibiting the production of proteins that are crucial for bacterial growth and replication.
B. "Tetracycline blocks RNA synthesis."
Explanation: This statement is incorrect. Tetracycline primarily affects protein synthesis, not RNA synthesis. It doesn't block the creation of RNA molecules in bacteria.
C. "Tetracycline degrades the bacterial cell wall."
Explanation: This statement is incorrect. Tetracycline antibiotics do not target bacterial cell walls. Agents like penicillins and cephalosporins are examples of antibiotics that disrupt bacterial cell walls.
D. "Tetracycline binds to magnesium ions."
Explanation: This statement is incorrect. Tetracycline does bind to certain metal ions, but it's not primarily through magnesium ions. The binding to bacterial ribosomes is a key mechanism of action for tetracyclines.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise, our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.