What electrolyte inactivates troponin and allows actin and myosin to form a bridge enabling fibers to contract?
Magnesium.
Sodium.
Potassium.
Calcium.
The Correct Answer is D
Choice A rationale
Magnesium plays a role in various cellular functions, including enzyme activity and muscle contraction, but it does not directly inactivate troponin to enable actin and myosin interaction.
Choice B rationale
Sodium is essential for action potential generation and nerve impulse transmission but does not directly influence troponin activity or muscle contraction through actin and myosin bridge formation.
Choice C rationale
Potassium is critical for maintaining cellular resting membrane potential and repolarization of cells but does not play a direct role in inactivating troponin to facilitate muscle contraction.
Choice D rationale
Calcium is the electrolyte that inactivates troponin, allowing actin and myosin to form cross-bridges and contract muscle fibers. Calcium binds to troponin, causing a conformational change that exposes binding sites for myosin on actin filaments.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Many complementary or alternative therapies can interact with prescribed medications, potentially causing serious health problems.
Choice B rationale
This is not a valid reason for asking about alternative therapies, as the nurse's role is to ensure safe and effective use of prescribed medications.
Choice C rationale
Non-compliance is not the primary concern when asking about alternative therapies; potential interactions are.
Choice D rationale
The cost of treatments is a consideration, but it is not the primary reason for asking about alternative therapies.
Correct Answer is A
Explanation
Choice A rationale
Ineffective health maintenance is appropriate due to the patient's inability to provide names and purposes of medications, indicating insufficient knowledge of their regimen.
Choice B rationale
Noncompliance implies intentional refusal of medication, which is not evident here as the patient is unaware rather than refusing.
Choice C rationale
Acute confusion is not indicated as the patient appears oriented and not disoriented.
Choice D rationale
Risk-prone health behavior is not appropriate as it suggests engagement in harmful activities, which is not described.
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