Equilibria: compare question

A buffer solution can be prepared by mixing a weak acid with its conjugate base. An example is the ethanoic acid / sodium ethanoate buffer. The bicarbonate buffer system in blood uses carbonic acid, $\ce{H2CO3}$, and hydrogencarbonate ions, $\ce{HCO3-}$.

Compare the way these two buffer systems control pH when small amounts of acid or base are added.

In your answer, include:

• relevant chemical equations for each system
• an explanation of the roles of conjugate acid–base pairs