We chew our food with our teeth. The tongue mixes the food with saliva.
When we swallow the chewed food it goes down our oesophagus and enters our stomach using peristalsis (muscle contractions to break food down).
The thick liquid now enters the small intestine where the nutrients pass into the blood and then in the large intestine the solid waste is formed.
We measured the length of both intestines which is 9 metres!
The rectum holds the waste in place until we are ready to pass it as a stool.