Amphoteric agents are substances that can act as both acids and bases, depending on the environment they are in. This dual behavior allows them to react with both acidic and basic compounds, making them versatile in various chemical reactions. Common examples include water and amino acids, which can donate or accept protons. In biological systems, amphoteric agents play crucial roles in maintaining pH balance. For instance, bicarbonate acts as an amphoteric agent in the human body, helping to regulate acidity in the blood. This property is essential for many biochemical processes, ensuring that conditions remain stable for cellular functions.