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 B
Explanation
A client who has been NPO for four days is most at risk to develop skin breakdown. This is because being NPO (nothing by mouth) can lead
to malnutrition and dehydration, which are both risk factors for bedsores. Malnutrition can impair the skin’s ability to heal and resist infection, while dehydration can make the skin dry and fragile.
Choice A is wrong because applying powder after drying the skin can help prevent moisture and friction, which are also risk factors for bedsores.
Choice C is wrong because bathing twice a week may not be frequent enough to keep the skin clean and free of irritants, which can also contribute to bedsores.
Choice D is wrong because hypertension (high blood pressure) does not directly cause bedsores, although it may be associated with other conditions that affect blood circulation and tissue oxygenation.
Correct Answer is A
Explanation
This is the proper way to obtain a throat culture, which is a test to look for infections in the back of the throat.
Some possible explanations for the other choices are:
Choice B is wrong because there is no need to avoid eating or drinking after a throat culture.
The swab does not interfere with the normal function of the mouth or throat.
Choice C is wrong because coughing while swabbing the throat could contaminate the sample or cause discomfort to the client. The swab should be gently passed along the back area of the throat and tonsils.
Choice D is wrong because swabbing only the anterior tongue would not collect enough cells from the infected area. The swab should reach the back of the throat where bacteria or fungi may grow.
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