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.
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.