sábado, 18 de febrero de 2017

DIGESTIVE SYSTEM

The digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body. Food passes through a long tube inside the body , the gastrointestinal tract.It is made up of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. In addition to the alimentary canal, there are several important accessory organs that help your body to digest food...

FUNCTIONS OF THE DIGESTIVE PROCESS

Ingestion: food is crushed by the teeth and mixed with saliva.

Digestion: juice enzymes break down nutrients into simpler molecules.

Absorption: simple molecules pas trough  the walls of the tube and are transported through the blood.

Assimilation: cells use nutrients to obtain energy or make new molecules.


Defecation: undigested or non-absorbed sustances are removed by the anus.

Resultado de imagen de digestive system
Digestion begins in the mouth. 
The teeth crush the food
 and the secretions of the salivary 
glands moisten them and initiate
 their chemical decomposition into 
the food bolus. Then, the bolus
 crosses the pharynx, continues 
through the esophagus and reaches
 the stomach whose mucous 
secretes the potent gastric juice, in 
the stomach, the food is agitated to 
become in the chyme.At the exit of 
the stomach, the digestive tube is
 prolonged with the small intestine. 
The digestivetract continues through 
the largeintestine, Its final portion is
 therectum,which ends in the anus,
 through which the indigestible 
remains of food are evacuated.