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- The organ level is formed when different types of tissues join together.
- Organs are compared to paragraphs, which are made from sentences.
- An organ is made of two or more types of tissues.
- Organs have specific functions and recognizable shapes.
- Examples of organs include the stomach, skin, bones, heart, liver, lungs, and brain.
- The stomach is made of several different tissues.
- The outer layer of the stomach includes epithelial and connective tissue.
- This outer layer reduces friction as the stomach moves.
- Beneath the outer layer are three layers of smooth muscle tissue.
- Smooth muscle contracts to churn and mix food.
- Smooth muscle also pushes food into the small intestine.
- The inner lining of the stomach is epithelial tissue.
- This inner lining produces fluids and chemicals for digestion.
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