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Digestive tract

Digestive tract, also known as the gastrointestinal (GI) tract or digestive system, is a long, muscular tube that starts at the mouth and ends at the anus. Its primary function is to break down food into nutrients that can be absorbed by the body and eliminate waste.

The digestive tract is composed of several organs, including the mouth, esophagus, stomach, small intestine, large intestine (colon), rectum, and anus. Each organ plays a unique role in the digestion and absorption of nutrients.

The mouth is the first part of the digestive tract, where food is chewed and mixed with saliva, which contains enzymes that begin the process of breaking down carbohydrates.

The esophagus is a muscular tube that connects the mouth to the stomach, and it moves food down through the process of peristalsis, which is a series of muscular contractions.

The stomach is a sac-like organ that mixes food with gastric acid and digestive enzymes, breaking down food into a liquid consistency known as chyme.

The small intestine is a long, narrow tube that receives chyme from the stomach and is the primary site of nutrient absorption. The small intestine is lined with tiny finger-like projections called villi and microvilli, which increase the surface area for absorption.

The large intestine, or colon, is a wider tube that absorbs water and electrolytes from the remaining chyme, forming feces, which is then eliminated from the body through the rectum and anus.

Overall, the digestive tract plays a vital role in the body’s ability to digest and absorb nutrients from food, and any issues with the digestive system can lead to digestive problems and nutritional deficiencies.

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