Which of the following is a primary function of sodium ions (Na+) in the human body?

• A. Regulating blood pressure
• B. Storing genetic information
• C. Transporting oxygen in the blood
• D. Catalyzing metabolic reactions

Answer: (A)

Verified step by step guidance

1. Begin by identifying the role of sodium ions (Na+) in the human body. Sodium ions are essential electrolytes that play a crucial role in various physiological processes.
2. Understand that sodium ions are involved in maintaining fluid balance and are critical for nerve function and muscle contraction.
3. Recognize that one of the primary functions of sodium ions is to help regulate blood pressure. This is achieved through their role in controlling the volume of extracellular fluid and influencing the osmotic balance.
4. Consider the other options provided: storing genetic information, transporting oxygen in the blood, and catalyzing metabolic reactions. These functions are not associated with sodium ions. For example, genetic information is stored in DNA, oxygen is transported by hemoglobin, and enzymes typically catalyze metabolic reactions.
5. Conclude that the correct answer is regulating blood pressure, as this is a well-established function of sodium ions in the human body.