Identify the Function of Protein Buffers in the Blood

Identify the function of protein buffers in the blood.

A) They provide immunity against foreign substances that invade the body.
B) They prevent the entry of sodium inside the cells and the exit of potassium from the cells.
C) They prevent excessive fluid leakage from cells.
D) They pick up and release excess hydrogens from the blood to balance its pH.
E) They ensure that the blood glucose level is maintained within a specific range.