Aside from storing bile, what other functions does the gallbladder perform?

Helps fat digestion: The liver manufactures/breaks down heme/red cells forming billlirubin/bile which is then transported via the "billiary tree" as pictured here and then stored in the gallbladder. When you eat, the bile is then transported into your intestine to help digest food/emulsify fats to absorbable form. That is basicaly what gallbladder does. If you have gallbladder trouble, consult doc. Good luck.