The gallbladder concentrates and stores bile as a pear-shaped sac which it can release to help digestion after a fatty meal.
Insoluble fiber does not dissolve in water. It does not get broken down by the bacteria in the large intestine. Since it passes essentially unchanged through the intestines, it produces little gas. Insoluble fiber, also known as roughage helps digestion by absorbing water in the intestine which results in smoother cleaning of the bowels. Cellulose, hemicellulose, and lignin are examples of insoluble fiber.