What are electrolytes?

Electrolytes are substances that dissociate into ions when dissolved in a solvent, typically water, and are essential for a variety of bodily functions. They include salts and other chemicals that are found in body fluids such as blood, urine, and intracellular fluid. These dissolved substances play crucial roles in maintaining fluid balance, conducting electrical impulses necessary for muscle contractions and nerve signaling, and regulating the body's pH level.

The role of electrolytes is vital in processes like hydration, muscle function, and acid-base balance. Sodium, potassium, calcium, and magnesium are common examples of electrolytes that are critical for biological functions.

While some of the other options touch on related concepts—such as nerve impulses and pH regulation—they do not accurately define what electrolytes are. For instance, the concept of detectable neurological activities involves brain function rather than the definition of electrolytes themselves. Thus, the definition that describes them as certain salts and other chemicals dissolved in body fluids is the most comprehensive and accurate.