what is the primary function of surfactant in the lungs
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Nursing Elites

HESI LPN

HESI PN Exit Exam

1. What is the primary function of surfactant in the lungs?

Correct answer: A

Rationale: The primary function of surfactant in the lungs is to reduce surface tension in the alveoli. This reduction in surface tension prevents lung collapse and allows for easier breathing. It is particularly crucial in premature infants to help with lung expansion. Choice B is incorrect because surfactant primarily affects surface tension, not oxygen absorption. Choice C is incorrect because surfactant's main role is not in facilitating carbon dioxide release. Choice D is incorrect because surfactant does not directly increase lung volume; its main role is in reducing surface tension.

2. The mother of a 9-month-old child diagnosed with respiratory syncytial virus (RSV) yesterday calls the clinic to inquire if it will be all right to take her infant to a friend's child's first birthday party the following day. Which response should the nurse provide?

Correct answer: A

Rationale: The correct response is A: 'Do not expose other children as the virus is very contagious even without direct contact.' RSV is highly contagious, especially in young children. Allowing the infected child to attend a birthday party can put other children at risk of contracting the virus. Choice B is incorrect as RSV can remain contagious for a period of time. Choice C is not sufficient, as wearing a mask may not entirely prevent the spread of the virus. Choice D is inaccurate, as children under 5 months are not the only ones susceptible to RSV; all young children are at risk.

3. A dispersion consists of a solute dispersed through a dispersing vehicle. Which of the following dispersions is a liquid for topical application that contains insoluble solids or liquids?

Correct answer: B

Rationale: The correct answer is B, 'Lotion.' A lotion is a liquid dispersion that contains insoluble solids or liquids for topical application. Ointments are more semi-solid and occlusive, pastes are thicker and contain higher concentrations of solids, and gels have a jelly-like consistency due to their three-dimensional network structure. Therefore, among the options, a lotion is the most suitable choice for containing insoluble solids or liquids for topical application.

4. What intervention should the PN implement when taking the rectal temperature of an adult client?

Correct answer: C

Rationale: When taking a rectal temperature, it is essential to hold the thermometer in place the entire time to ensure safety, accuracy, and prevent the thermometer from slipping out. Choice A, lubricating the tip of the thermometer with a water-based gel, is important for comfort and ease of insertion. Choice B, gently inserting the thermometer 1 inch into the rectum, is more accurate for adults than inserting it 3 inches. Choice D, placing the client in the left lateral position, is not necessary for a rectal temperature measurement.

5. The UAP reports to the PN that an assigned client experiences SOB when the bed is lowered for bathing. Which action should the PN implement?

Correct answer: B

Rationale: Advising the UAP to allow the client to rest before completing the bath is the most appropriate action to take. This helps manage the shortness of breath (SOB) experienced by the client and prevents further stress. By giving the client time to rest, the PN ensures the client's comfort and safety during care activities. The other options are not the most immediate or appropriate actions in this scenario: obtaining further data about activity intolerance (choice A) may delay addressing the current issue, obtaining vital signs and pulse oximetry (choice C) is important but not as immediate as allowing the client to rest, and notifying the healthcare provider (choice D) is premature before trying a simple intervention like allowing the client to rest.

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