small intestine

The small intestine is a long, narrow tube in your digestive system that breaks down food and absorbs nutrients into your bloodstream. It’s divided into three parts: the duodenum, jejunum, and ileum. After food leaves your stomach, it enters the small intestine where digestive enzymes and bile further break it down. Tiny finger-like structures called villi line the walls, increasing surface area to maximize nutrient absorption. The small intestine plays a crucial role in providing your body with the energy and building blocks needed for maintenance, growth, and health.