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The rib cage consists of 24 ribs (2 sets of 12), which are attached to the sternum. It protects the heart and lungs and aids in breathing.


Food is brought to the stomach through a relatively straight tube called the esophagus. The food is moved by a sequential series of smooth contractions called peristalsis.


During digestion, the food is held for a while in the stomach to mix with gastric juices secreted from the cells of the stomach's inner lining.

Small intestine

The digestive process continues in the small intestine, where nutrients are absorbed with the help of thousands of finger-like projections called villi.


These are spongy, air-filled organs of the respiratory system that allow us to breathe.