The gallbladderconcentrates and stores bile as a pear-shaped sac which it can release to help digestion after a fatty meal.
Muscle fiber types are divided into two categories â€“ slow twitch and fast twitch. Fast twitch fibers get their name because they cause rapid muscle contraction although the amount of contraction is the same as with slow twitch fibers. An individualâ€™s predisposition to a given sport is to a large extent dependent upon the predominance of a given fiber type. Fast twitch fibers enable us to generate power and speed in short bursts. These fibers tire quickly because they use anaerobic metabolism for generating energy. Athletes such as sprinters and powerlifters that depend upon short bursts of power to execute their disciplines make use of fast twitch muscle fiber.