Human Digestive System

 

Digestive system begins at the mouth where food is mixed with saliva to make it soft and it is cut and ground into small pieces.

Buccal cavity, commonly known as the mouth, acts as an entrance to the digestive system. It consists of lips, cheeks,
teeth and gums.

Food then goes into the stomach via Esophagus. The esophagus is also known as food pipe.

The stomach secretes HCL and pepsin. These juices mix with food and break it down further.

Partially digested food (also known as chyme) then moves into the duodenum. The duodenum is the first and shortest segment of the small intestine. Digestive juices from pancreas, liver and gall-bladder mix with chyme here to break it down further.

Food particles then move into lower segments (jejunum and ileum) of the small intestine. The ileum is the longest section of small intestine. Tiny finger like structures are present on the lining of the small intestine. These structures are called villi of the small intestine. Villi absorb nutrients from digested food into the blood. Digestion of food ends at the small intestine.Undigested food enters large intestine and large intestine absorbs water and salt from it. and The remaining waste material is stored as feces before being removed by defecation.

The whole passage along which food passes through the body from the mouth and expelled as solid waste from the anus is known as alimentary canal.

.Small Intestine - Where bile from the liver, and other digestive enzymes, help break down the food even more; the nutrients are absorbed into the blood stream. 

Oesophagus – A long tube that squeezes food down from the mouth to the stomach. 

Stomach – Food is churned and mixed with acids to form a liquid.

Anus – Where the stool exits the body and into the toilet.  

Salivary Glands – Saliva is produced to help break down the food in the mouth.

Mouth – Where food enters the body and is chewed up into small pieces by the teeth.

Large Intestine – Absorbs water and remaining nutrients. The remaining food waste knows as stool, faeces or poo is moved on to the rectum.