Decreased surfactant production in the preterm lung is a problem because surfactant
dilates the bronchioles, decreasing airway resistance.
provides transportation for oxygen to enter the blood supply.
keeps the alveoli open during expiration.
causes increased permeability of the alveoli.
The Correct Answer is C
Choice A) dilates the bronchioles, decreasing airway resistance: This is not the correct function of surfactant.
Surfactant is a substance that reduces the surface tension of the fluid that lines the alveoli, which are the tiny air sacs in the lungs where gas exchange occurs. Surfactant does not affect the diameter of the bronchioles, which are the small airways that branch from the bronchi. Bronchodilation and bronchoconstriction are regulated by the autonomic nervous system and various mediators, such as histamine, epinephrine, and acetylcholine.
Choice B) provides transportation for oxygen to enter the blood supply: This is not the correct function of surfactant. Surfactant does not transport oxygen or any other gas. Oxygen diffuses from the alveoli into the capillaries, where it binds to hemoglobin in the red blood cells. The red blood cells then transport oxygen to the tissues via the blood circulation. Surfactant does not play a role in this process.
Choice C) keeps the alveoli open during expiration: This is the correct function of surfactant. Surfactant prevents the alveoli from collapsing during expiration by lowering the surface tension of the fluid that lines them. This allows for easier breathing and better gas exchange. Without enough surfactant, the alveoli tend to collapse and stick together, causing atelectasis, which is a condition where some or all of a lung collapses. Atelectasis can lead to hypoxia, respiratory distress, and infection.
Choice D) causes increased permeability of the alveoli: This is not the correct function of surfactant. Surfactant does not increase or decrease the permeability of the alveoli, which is the ability of substances to pass through them.
Permeability of the alveoli depends on several factors, such as pressure gradients, solubility, molecular size, and membrane thickness. Increased permeability of the alveoli can occur in conditions such as acute respiratory distress syndrome (ARDS), where fluid leaks into the alveolar space and impairs gas exchange. Surfactant does not cause this condition, but it can be affected by it.

Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice a) Insert an indwelling urinary catheter is incorrect because this is not a priority action for a client who has a large amount of painless, bright red vaginal bleeding. This type of bleeding is suggestive of placenta previa, which is a condition where the placenta covers part or all of the cervix, preventing normal delivery. Inserting an indwelling urinary catheter can cause trauma to the cervix or the placenta, which can worsen the bleeding and endanger the mother and the fetus. Therefore, this action should be avoided unless absolutely necessary.
Choice b) Prepare the abdominal and perineal areas is incorrect because this is not a priority action for a client who has a large amount of painless, bright red vaginal bleeding. This type of bleeding is suggestive of placenta previa, which is a condition where the placenta covers part or all of the cervix, preventing normal delivery. Preparing the abdominal and perineal areas can be done before performing a cesarean section, which is usually the preferred mode of delivery for placenta previa. However, this action should be done after stabilizing the client's condition and obtaining informed consent for surgery.
Choice c) Witness the signature for informed consent for surgery is incorrect because this is not a priority action for a client who has a large amount of painless, bright red vaginal bleeding. This type of bleeding is suggestive of placenta previa, which is a condition where the placenta covers part or all of the cervix, preventing normal delivery.
Witnessing the signature for informed consent for surgery can be done before performing a cesarean section, which is usually the preferred mode of delivery for placenta previa. However, this action should be done after stabilizing the client's condition and explaining the risks and benefits of surgery.
Choice d) Initiate IV access is correct because this is the priority action for a client who has a large amount of painless, bright red vaginal bleeding. This type of bleeding is suggestive of placenta previa, which is a condition where the placenta covers part or all of the cervix, preventing normal delivery. Initiating IV access can help to restore fluid volume, prevent hypovolemic shock, administer medications such as oxytocin or blood products if needed, and prepare for emergency cesarean section if indicated. Therefore, this action should be done as soon as possible to save the life of the mother and the fetus.

Correct Answer is D
Explanation
Choice a) We are protecting the infant from our bacteria is incorrect because this is not the main reason why gloves are needed when handling a newborn. While it is true that newborns have immature immune systems and are susceptible to infections, gloves are not only used to protect the infant from our bacteria but also to protect ourselves from the infant's body fluids and secretions, which may contain pathogens or blood-borne diseases.
Therefore, this response is incomplete and misleading.
Choice b) Amniotic fluid and maternal blood pose risks to us is incorrect because this is also not the primary reason why gloves are needed when handling a newborn. While it is true that amniotic fluid and maternal blood may contain harmful microorganisms or viruses that can infect us, gloves are not only used to protect ourselves from these substances but also to protect the infant from our skin flora and potential contaminants, which may cause skin irritation or infection. Therefore, this response is also incomplete and misleading.
Choice c) It is hospital policy is incorrect because this is not a sufficient or satisfactory reason why gloves are needed when handling a newborn. While it is true that wearing gloves may be a hospital policy or protocol, this response does not explain the rationale or evidence behind this policy and may imply that the nurse does not understand or agree with it. Therefore, this response is vague and unprofessional.
Choice d) It is part of standard precautions is correct because this is the best and most accurate reason why gloves are needed when handling a newborn. Standard precautions are a set of guidelines and practices that aim to prevent the transmission of infections in healthcare settings. They include wearing gloves, gowns, masks, and eye protection when there is a risk of exposure to blood or body fluids, as well as washing hands before and after patient contact, cleaning and disinfecting equipment and surfaces, and disposing of waste properly. Standard precautions apply to all patients, regardless of their diagnosis or infection status, and are based on the principle that all blood and body fluids are potentially infectious. Therefore, this response is clear and appropriate.
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