Question

how do buffers play a role in homeostasis in living things?

Explanation:

Buffers are substances that resist changes in pH. In living things, they help maintain a stable internal environment (homeostasis). For example, in human blood, the bicarbonate buffer system (H₂CO₃/HCO₃⁻) can absorb excess H⁺ (from metabolic processes like exercise - lactic acid production) or OH⁻ (if there is a base - rich intake). By doing so, they keep the pH of the blood within a narrow range (around 7.35 - 7.45), which is crucial for the proper functioning of enzymes (most enzymes have an optimal pH for activity). If pH changes too much, enzyme structure (and thus function) can be affected (denaturation), disrupting biochemical reactions necessary for life.

Answer:

Buffers resist pH changes, maintaining a stable internal environment (homeostasis). For example, the bicarbonate buffer system in blood keeps pH within a narrow range (7.35 - 7.45), crucial for enzyme function. If pH changes too much, enzyme structure (and function) can be affected (denaturation), disrupting biochemical reactions.