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- The stomach, a large muscular sac, lies
- just below the ribs in the upper left-hand part
- of the abdominal cavity. Besides acting as a
- storage organ for food, thus permitting
- discontinuous feeding, the stomach has two other
- functions. The stomach is composed of three
- layers, including an outer layer of connective
- tissue, a thick middle layer of smooth muscle,
- and an inner layer of connective tissue and
- columnar epithelial cells.
- The stomach helps with the mechanical
- breakup of food. Waves of contraction in the
- muscular middle layer of the stomach churn
- the food, breaking it up as well as mixing it
- with gastric juices. The stomach also aids
- in the enzymatic digestion of food. Some of
- the inner layers' glands secrete a mucous
- lining for the stomach, protecting it from
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