The liver produces various chemicals that are required for proper functioning of the body. It plays an important role in detoxification of potentially harmful chemicals. Pharynx, a 5 inch long conical, fibro muscular cavity and in the throat is situated posterior to the nasal and oral cavities and posterior to the larynx. This is why the pharynx can be divided into three regions depending on the position. The three regions are nasopharynx (behind the nasal cavities), the or pharynx (behind the buckle cavity) and the laryngopharynx (behind the larynx). Only air passes from the nose through the nasopharynx, while both food and air pass from the mouth into the or pharynx. The third section, that is the laryngopharynx, once again only permits passage of air going to the lungs. Thick connective tissues and muscle fibers attach the pharynx to the base of the skull. Moreover, in the walls of the pharynx exist both longitudinal as well as circular muscles. The alternating contractions of these muscles causes the bolus to move from the pharynx into the food pipe or esophagus.

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