Final answer:
The electrolytes present in saliva are sodium, potassium, chloride, and bicarbonate; these play significant roles in various bodily functions such as nerve excitability and fluid regulation.
Step-by-step explanation:
The question asks which of the following electrolytes are present in saliva. The primary electrolytes found in body fluids, including saliva, are sodium, potassium, chloride, bicarbonate, calcium, and phosphate. Therefore, the correct answer to the question would be (a) Potassium, sodium, chloride, bicarbonate. These electrolytes have various roles such as aiding in nerve excitability, endocrine secretion, membrane permeability, buffering body fluids, and controlling the movement of fluids between compartments.