It is a muscular part. it is hollow and dilated part. it functions as an important organ it digests the food  and mixes it with enzymes and digests it...
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The walls of stomach secretes hcl.these secretions are stimulated by nervous system.the contraction of stomach muscles squeeze and mix the food ewith acids and juvcies.the digestion of some semisolid fluid takes place.hence it is called mixer or digestor.
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