The nurse is caring for a client at risk for a respiratory infection.
Which of the following natural respiratory defense mechanisms help defend against infection? (Select all that apply).
Cilia lining the respiratory tract sweep debris upward in mucus to be swallowed.
The respiratory tract cools and dries the air being inhaled.
Cells in the respiratory tract secrete lysozymes that can destroy certain bacteria.
Macrophages engulf and destroy bacteria found in the alveoli.
High concentration of oxygen and carbon dioxide aid the defense mechanisms.
Correct Answer : A,C,D
These are natural respiratory defense mechanisms that help defend against infection.
Choice A is correct because cilia lining the respiratory tract sweep debris upward in mucus to be swallowed.
This prevents pathogens and particles from reaching the lungs.
Choice B is wrong because the respiratory tract does not cool and dry the air being inhaled. In fact, the respiratory tract warms and humidifies the air to facilitate gas exchange.
Choice C is correct because cells in the respiratory tract secrete lysozymes that can destroy certain bacteria.
Lysozymes are enzymes that break down the cell walls of bacteria.
Choice D is correct because macrophages engulf and destroy bacteria found in the alveoli. Macrophages are a type of white blood cell that act as scavengers of foreign invaders.
Choice E is wrong because high concentrations of oxygen and carbon dioxide do not aid the defense mechanisms.
On the contrary, high levels of these gases can impair gas exchange and cause acid-base imbalance.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Insert a sterile needle and aspirate 3 to 5 mL of urine into the syringe. This is the best technique for obtaining a sterile urine specimen from an indwelling urinary catheter because it ensures that microorganisms in the specimen are from the urine, and not the result of contamination.
Choice B is wrong because it does not use sterile technique and it does not collect fresh urine. The urine in the drainage bag may have been sitting there for a long time and may not reflect the current condition of the patient’s urinary tract.
Choice C is wrong because it does not use sterile technique and it flushes the catheter with sterile water, which may dilute the urine and alter its composition.
Choice D is wrong because it does not use sterile technique and it collects urine from the drainage bag, which may be contaminated or stale.
Correct Answer is B
Explanation
The nurse should make the statement “The client has hypoxemia after 10 minutes on a rebreather mask.” first. This is because SBAR (Situation- Background-Assessment-Recommendation) is a communication tool that helps provide essential, concise information, usually during crucial situations. The first component of SBAR is Situation, which is a concise statement of the problem.
The nurse should state the most urgent and relevant problem first, which is the client’s hypoxemia.
Choice A is wrong because it is not a clear statement of the situation.
It is vague and does not provide specific information about the client’s condition or vital signs.
It also expresses the nurse’s feeling rather than an objective assessment.
Choice C is wrong because it is part of the Assessment component of SBAR, not the Situation.
It provides numerical data about the client’s blood gas analysis, but it does not state the problem or the reason for calling the healthcare provider.
Choice D is wrong because it is part of the Background component of SBAR, not the Situation.
It provides pertinent and brief information related to the situation, such as the client’s medical history and diagnosis, but it does not state the current problem or concern.
Normal ranges for blood gas analysis are:
- PaO2: 80-100 mmHg
- PaCO2: 35-45 mmHg
- HCO3: 22-26 mEq/L
Hypoxemia is defined as a low level of oxygen in the blood, usually below 60 mmHg.
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