what is the primary role of the sinoatrial sa node in the heart
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Nursing Elites

HESI LPN

HESI PN Exit Exam

1. What is the primary role of the sinoatrial (SA) node in the heart?

Correct answer: A

Rationale: The correct answer is A: Pacemaker of the heart. The SA node, known as the natural pacemaker, initiates the electrical impulses that set the rhythm for the heartbeat. It is responsible for coordinating the heart's contractions by generating electrical signals at regular intervals. Choice B is incorrect as the SA node's primary function is not related to blood pressure regulation. Choice C is incorrect as the SA node does not cause electrical conduction delay but rather initiates and conducts the electrical impulses. Choice D is incorrect as the SA node does not directly stimulate muscle contraction but rather initiates the electrical events that lead to muscle contraction.

2. What is the most common sign of a localized infection?

Correct answer: C

Rationale: The correct answer is C: Redness, warmth, and swelling at the site of infection. These signs are typical indications of a localized infection, representing inflammation and the body's immune response to the pathogen. Fever (choice A) is a systemic response and not specific to a localized infection. Elevated white blood cell count (choice B) can be seen in both localized and systemic infections. Chills and shivering (choice D) are more related to the body's response to fever and not specifically indicative of a localized infection.

3. A female client taking a liquid iron preparation expresses concern that her tooth color has darkened since starting the medication. What action should the PN implement?

Correct answer: A

Rationale: The correct action for the PN to implement is to teach the client to use a straw when taking the medication to reduce further tooth staining. Using a straw minimizes contact between the iron preparation and the teeth, helping prevent additional staining. Choice B is incorrect because withholding doses without consulting the healthcare provider could be detrimental to the client's health. Choice C is incorrect because darkening of tooth color is not an expected effect of liquid iron preparation and should not be reassured as a desired effect. Choice D is incorrect as it does not directly address the client's concern about tooth staining.

4. During a routine prenatal visit at the antepartal clinic, a multipara at 35-weeks gestation presents with 2+ edema of the ankles and feet. Which additional information should the PN report to the RN?

Correct answer: B

Rationale: Blood pressure is the most critical information to report to the RN in this scenario. The presence of edema, along with high blood pressure, can be indicative of preeclampsia, a severe condition in pregnancy. Monitoring blood pressure is essential for assessing the patient's condition and taking appropriate actions if necessary. Choices A, C, and D are not as urgent in this situation. The due date, gravida, and parity are important for overall assessment but do not address the immediate concern of potential preeclampsia. Fundal height is used to assess fetal growth and position but is not the priority when edema and high blood pressure are present.

5. The nurse is assisting with the admission of a young adult female Korean exchange student with acute abdominal pain. Although the client has been able to easily answer questions, when asked about sexual activity, she looks away. What action should the nurse take?

Correct answer: D

Rationale: Observing the client's response to another question is the most appropriate action in this scenario. By doing so, the nurse can assess whether the client's discomfort is due to cultural sensitivity or a misunderstanding. This approach allows the nurse to proceed with sensitivity and respect, ensuring effective communication. Option A is incorrect because omitting the section of the assessment form may result in missing crucial information relevant to the client's condition. Option B jumps to assumptions about a language barrier without confirming it first. Option C focuses on rewording the question without addressing the underlying issue causing the client's discomfort, which may not necessarily be due to a lack of understanding.

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