Digestion is a vital process where complex food substances are broken down into simpler and absorbable molecules so that they could be easily absorbed.
The digestive system plays a significant role in the digestion process and is composed of the alimentary canal and other associated glands. The alimentary canal is divided into five main parts- mouth, oesophagus, stomach, small intestine, small intestine and lastly large intestine.
Also Refer: Alimentary Canal
Diagram Of Digestive System
The diagram below shows the structure and functions of the human digestive system.
Mouth — It includes teeth, salivary glands, and tongue. It is the beginning of the digestive tract and the process of digestion begins here, where teeth help by breaking and grinding the food molecules followed by the saliva mixing with food particles
Pharynx –It is a fibromuscular Y-shaped tube-like structure, attached to the terminal end of the mouth. It is involved in the passage of chewed food from the mouth through the oesophagus.
Oesophagus –This is a muscular tube measuring 25cm long, located near the trachea connecting to the pharynx. It is the upper part of the gastrointestinal tract and is mainly involved in delivering the food from the mouth to the stomach.
Stomach –It is a hollow and muscular organ, situated towards the left side of the abdominal cavity, beneath the diaphragm. It is a vital organ, which functions by storing for the food, provides enough time to digest meals, produces hydrochloric acid and digestive enzymes that maintain the process of digestion.
Small Intestine –It is a thin and long tube-like structure measuring about 9 to 10 feet long and a part of the lower gastrointestinal tract. It is located just behind the stomach and is found completely coiled and consists of folds and ridges.
Large Intestine –This is a thick and long tube-like structure measuring about 4 to 5 feet in length. It is present just beneath the stomach and wraps over the superior and lateral edges of the small intestine. It functions by absorbing water and support in the breakdown of wastes to fetch small nutrients.
Liver –The liver is a large, reddish-brown, triangular-shaped organ of the digestive system, which is located to the right of the stomach. It functions by processing the absorbed food from the small intestine, produces bile, which helps in the digestion of fat in the small intestine.
Also Refer: Types of teeth in humans
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