Which electrolytes are crucial for normal metabolism?

The correct combination of electrolytes essential for normal metabolism includes potassium (K+), sodium (Na+), chloride (Cl-), and bicarbonate (HCO3-).

Potassium is vital for various cellular functions, including nerve impulse transmission and muscle contraction. Sodium plays a significant role in maintaining fluid balance, osmotic pressure, and is critical for nerve function. Chloride works closely with sodium to help maintain acid-base balance and fluid regulation. Bicarbonate is essential for buffering acids in the body, which is important in maintaining the body's pH within a narrow range.

Together, these electrolytes support metabolic processes by facilitating nerve signaling, muscle function, and the maintenance of homeostasis in the body. Their interconnected roles highlight the importance of each in ensuring that cellular metabolism proceeds efficiently.

The other options contain important elements or minerals, but they do not encompass the key electrolytes most critical for metabolic processes. For example, calcium and magnesium are important for specific metabolic pathways and muscle function, while iron and trace metals like zinc and copper are crucial for enzymatic reactions but are not classified as primary electrolytes.