Question

what makes a good buffer? is it that it has a strong base and a strong acid?
and why is blood a good buffer? is that because the oxygen it carries acts as a strong base?
No, no, and no.
A buffer is made with a weak acid and its salt OR a weak base and its salt. For example, an acid buffer can be made with acetic acid and sodium acetate. A basic buffer can be made with NH3 and NH4Cl.

Blook is a good buffer because of the CO2.
H2O + CO2 ==> H^+ + HCO3^-

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