What is the main function of the Na-K pump at the cellular level?
Move Na inside the cell
Move K out of the cell
Move Na out of the cell
Move Na and K inside the cell
The Correct Answer is C
Choice A: Move Na Inside the Cell
The primary function of the Na-K pump, also known as the sodium-potassium pump, is to move sodium (Na) ions out of the cell, not into the cell. This pump actively transports three sodium ions out of the cell for every two potassium ions it brings in. Therefore, this choice is incorrect.
Choice B: Move K Out of the Cell
The Na-K pump moves potassium (K) ions into the cell, not out of the cell. This active transport mechanism helps maintain the necessary concentration gradients of sodium and potassium across the cell membrane, which are crucial for various cellular functions, including maintaining the resting membrane potential.
Choice C: Move Na Out of the Cell
The main function of the Na-K pump is to move sodium ions out of the cell. For every cycle of the pump, three sodium ions are exported out of the cell, and two potassium ions are imported into the cell. This process is essential for maintaining the electrochemical gradient across the cell membrane, which is vital for nerve impulse transmission, muscle contraction, and overall cellular homeostasis.
Choice D: Move Na and K Inside the Cell
This choice is incorrect because the Na-K pump does not move both sodium and potassium ions inside the cell. Instead, it moves sodium ions out of the cell and potassium ions into the cell. This active transport mechanism is crucial for maintaining the proper ionic balance and membrane potential necessary for various physiological processes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","C","E"]
Explanation
Choice A Reason:
Naming, blaming, and shaming those who make errors is not an effective way to prevent medication errors. This approach can create a culture of fear and silence, where healthcare professionals may be less likely to report errors or near misses. Instead, fostering a culture of safety and openness encourages reporting and learning from mistakes, which is crucial for preventing future errors.
Choice B Reason:
Using electronic medical order entry systems is an effective way to prevent medication errors. These systems help reduce errors related to handwriting, transcription, and dosage calculations. They can also provide clinical decision support, alerting prescribers to potential drug interactions, allergies, and other contraindications. This technology enhances accuracy and efficiency in the medication ordering process.
Choice C Reason:
Helping patients to be active, informed members of the healthcare team is another effective strategy. When patients are well-informed about their medications, they can help identify potential errors and ensure they are taking their medications correctly. Patient engagement and education are key components in preventing medication errors and improving overall healthcare outcomes.
Choice D Reason:
Focusing on caregivers who make errors is not an effective strategy for preventing medication errors. Similar to choice A, this approach can lead to a punitive environment that discourages error reporting and transparency. Instead, focusing on system improvements and creating a supportive environment for healthcare professionals is more effective in reducing errors.
Choice E Reason:
Developing nonpunitive approaches to track errors is an effective way to prevent medication errors. A nonpunitive approach encourages healthcare professionals to report errors and near misses without fear of retribution. This allows for the identification of error patterns and the implementation of system-wide changes to prevent future errors. Creating a culture of safety and continuous improvement is essential for reducing medication errors.
Correct Answer is D
Explanation
Choice A: Minimal Effect on Vessels
A reduction in blood pH, which indicates acidosis, does not have a minimal effect on blood vessels. Acidosis can significantly impact vascular tone and function. Therefore, this choice is incorrect as it underestimates the physiological changes that occur in response to a decrease in pH.
Choice B: No Effect on Vessels
Similarly, stating that a reduction in blood pH has no effect on vessels is inaccurate. Blood pH is tightly regulated, and deviations from the normal range (7.35-7.45) can lead to significant physiological responses. Acidosis can alter vascular tone, making this choice incorrect.
Choice C: Vasodilation
While vasodilation can occur in response to certain conditions, a reduction in blood pH typically leads to vasoconstriction rather than vasodilation. Vasodilation is more commonly associated with an increase in blood pH (alkalosis) or other factors such as increased levels of nitric oxide or prostaglandins.
Choice D: Vasoconstriction
When the pH of blood reduces, indicating acidosis, it often leads to vasoconstriction. This response is mediated by chemoreceptors that detect changes in pH and stimulate the vasomotor center to increase vascular tone. Vasoconstriction helps to maintain blood pressure and ensure adequate perfusion of vital organs during acidosis. Therefore, this is the correct answer.

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