Digestive

Digestive refers to the biological process involved in breaking down food and absorbing nutrients to sustain the body's functions. The process begins in the mouth, where mechanical digestion occurs through chewing, and chemical digestion begins with enzymes in saliva that start breaking down starches. Food then travels through the esophagus to the stomach, a muscular organ that mixes food with gastric juices. These juices contain hydrochloric acid and enzymes such as pepsin, which aid in digesting proteins and sterilizing the food.

In the small intestine, digestion continues with the aid of enzymes from the pancreas and bile from the liver. The small intestine is the primary site for nutrient absorption, where nutrients like amino acids, sugars, fatty acids, vitamins, and minerals pass through the intestinal lining into the bloodstream or lymphatic system. The lining of the small intestine is covered with villi and microvilli, increasing the surface area for absorption.

The remaining undigested material moves into the large intestine (colon), where water and electrolytes are absorbed, and the waste is compacted into feces. The colon also hosts a diverse microbiome that plays a role in digesting certain fibers and synthesizing vitamins. Waste is eventually expelled through the rectum and anus during defecation.

The digestive system is crucial for maintaining energy balance, supporting growth, and ensuring the proper functioning of bodily systems. It involves a complex interplay of organs, enzymes, and microbiota, working continuously to convert food into usable resources. Disorders of the digestive system, such as acid reflux, irritable bowel syndrome, or inflammatory bowel disease, can impact health and require medical attention.