Final answer:
The normal blood potassium level range is 3.5-5.5 mEq/L. This range is essential for maintaining physiological functions and cellular homeostasis. Option A.
Step-by-step explanation:
The correct answer to the student's question concerning the normal range for potassium levels in the blood is option A: 3.5-5.5 mEq/L.
Potassium is the major intracellular cation that is crucial for numerous physiological functions, including the establishment of resting membrane potential in neurons and muscle fibers, as well as maintaining normal potassium concentration gradients between the intracellular fluid (ICF) and extracellular fluid (ECF).
The normal level of serum potassium is a reflection of the balance between intake, cellular uptake, and renal excretion, as influenced by insulin, carbohydrate utilization, and hormones such as aldosterone.
The information provided reinforces the significance of maintaining proper potassium levels, evidenced by the various roles potassium plays in cellular function and homeostasis. Option A is correct.