快快快!!! About digestive system!!!

Mechanical digestion
Mastication, the use of teeth to tear and crush food, and churning of the stomach.

Chemical digestion
Addition of chemicals (acid, bile, enzymes, and water) to break down complex molecules into simple structures,

Absorption
Movement of nutrients from the digestive system to the circulatory and lymphatic capillaries through osmosis, active transport, and diffusion,

Peristalsis
Peristalsis is the rhythmic contraction of smooth muscles to propel contents through the digestive tract.
Also:
Elimination: Removal of undigested materials from the digestive tract through defecation.
Underlying the process is muscle movement throughout the system, deglutition and peristalsis

bio書有架~=.=