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) A phase of the female menstrual cycle that involves the release of an egg (ovum) from one of the ovaries is incorrect because this is not the definition of Mittelschmerz, but rather the definition of ovulation. Ovulation is the process by which one or more eggs are released from the ovaries and travel to the fallopian tubes, where they can be fertilized by sperm. Ovulation usually occurs around the middle of the menstrual cycle, which is typically 28 days long, but can vary from person to person. Ovulation can be detected by changes in basal body temperature, cervical mucus, or hormone levels. Therefore, this response is inaccurate and misleading.
Choice B) A female reproductive organ in which ova or eggs are produced is incorrect because this is not the definition of Mittelschmerz, but rather the definition of ovary. The ovary is a paired organ that is located on either side of the uterus in the lower abdomen. The ovary contains thousands of follicles, which are sacs that contain immature eggs. Each month, one or more follicles mature and release an egg during ovulation. The ovary also produces hormones such as estrogen and progesterone, which regulate the menstrual cycle and pregnancy. Therefore, this response is irrelevant and inaccurate.
Choice C) The regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina is incorrect because this is not the definition of Mittelschmerz, but rather the definition of menstruation. Menstruation is the process by which the endometrium, which is the tissue that lines the uterus and prepares for implantation of a fertilized egg, is shed and expelled through the vagina if pregnancy does not occur. Menstruation usually occurs once a month and lasts for about 3 to 7 days, but can vary from person to person. Menstruation can be accompanied by symptoms such as cramps, bloating, mood swings, or headaches. Therefore, this response is irrelevant and inaccurate.
Choice D) One-sided, lower belly pain associated with normal ovulation. Usually occurs about 14 days before the next menstrual period is correct because this is the definition of Mittelschmerz. Mittelschmerz is a German word that means "middle pain". It refers to a mild to moderate pain or discomfort that some women experience in their lower abdomen around the time of ovulation. The pain may last for a few minutes to a few hours and may switch sides from month to month depending on which ovary releases an egg. The pain may be caused by irritation or stretching of the ovarian or abdominal wall by the maturing follicle or by fluid or blood released during ovulation.
Mittelschmerz is not a sign of any disease or problem and does not require any treatment. However, it can be confused with other conditions that cause pelvic pain, such as appendicitis, ectopic pregnancy, or ovarian cysts. Therefore, women who have severe or persistent pain should consult their doctor for diagnosis and treatment. Therefore, this response is clear and accurate.
Correct Answer is D
Explanation
Choice A: This is incorrect because pointing out how lucky she is to have a healthy baby may invalidate her feelings and make her feel guilty or ashamed. The nurse should acknowledge and respect the client's emotions and avoid making judgments or comparisons.
Choice B: This is incorrect because assessing her for pain is not the first action that the nurse should take. Although pain may be a factor that contributes to the client's emotional state, it is not the primary cause of her crying. The nurse should first establish rapport and trust with the client and then assess her physical and psychological needs.
Choice C: This is incorrect because explaining that she is experiencing postpartum blues may be premature and inaccurate. Postpartum blues are mild and transient mood changes that occur in up to 80% of women within the first few days after childbirth. They are characterized by tearfulness, irritability, anxiety, and mood swings. However, the nurse should not assume that the client has postpartum blues without performing a thorough assessment and ruling out other possible causes of her crying, such as postpartum depression, anxiety, or trauma.
Choice D: This is the correct answer because allowing her time to express her feelings is the most appropriate and empathetic action that the nurse should take first. The nurse should listen actively and attentively to the client and provide emotional support and reassurance. The nurse should also use open-ended questions and reflective statements to facilitate communication and explore the client's concerns and coping strategies.
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