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A PVC human lungs model is a life-sized or scaled replica of the human respiratory system, made from durable PVC plastic. It is commonly used for educational purposes to demonstrate lung structure, function, and anatomy, showing details like the trachea, bronchi, and alveoli. The model is often designed for interactive learning, allowing users to study respiratory mechanics

The small intestine consists of three parts. The first part, called the duodenum, connects to the stomach. The middle part is the jejunum. The third part, called the ileum, attaches to the colon.