Which mineral plays a pivotal role in regulating fluid equilibrium within the human organism?
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Answer: B. Potassium K+
Explanation
Potassium is a primary intracellular electrolyte that regulates fluid balance. This crucial mineral works alongside sodium to maintain proper osmotic pressure within cells. Cellular fluid equilibrium depends on the active transport of potassium across membranes. Potassium ions carry a positive charge and reside predominantly inside living body cells. The sodium-potassium pump regulates cellular ion concentrations to maintain resting membrane potentials. Dietary sources rich in potassium include bananas, potatoes, leafy greens, and citrus fruits.
Maintaining optimal potassium levels is vital for proper nerve conduction and muscle contraction. Electrolyte imbalances can cause dangerous cardiac arrhythmias, muscle cramps, and extreme fatigue. Medical conditions and intense dehydration often require careful monitoring of serum potassium levels. Calcium plays a primary structural role in bones and teeth rather than fluid regulation. Zinc functions mainly as an enzymatic cofactor supporting immune function and cellular metabolism. Phosphorus contributes to bone mineralization and nucleic acid synthesis within the human body.
- Subject
- Physical Education
- Category
- Physical Education
- Topic
- —
- Difficulty
- medium
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