There are a few other Beatles tunes where Lennon's choice of harmonica might not be obvious. The signature riff of Please Please Me is almost as distinctive as the intro to Love Me Do.
The bile that is secreted by the liver and stored in the gallbladder is not the same as the bile that is secreted by the gallbladder. During gallbladder storage of bile, it is concentrated by removal of some water and electrolytes.
The gallbladder is an organ that stores and transports bile produced by the liver. The function of bile is to break down and digest fatty foods in the small intestine. Humans can live without a gallbladder since bile can take other courses to reach the small intestine.