Teeth grind food into swallowable substance (bolus)
Mechanical and chemical digestion take place here
Enzymes in saliva start to break down starches.
Muscular contractions move the bolus to the stomach
These contractions are called peristalsis
No new digestion occurs
Stomach is very muscular and churns the food into a paste (chyme).
Stomach makes acid which helps break down proteins.
No new mechanical digestion takes place
Enzymes break down proteins, starches, and fats
Nutrients are absorbed into the bloodstream via the villi.
Undigested food (now called feces) passes into the large intestine.
Water, minerals, and vitamins are reabsorbed.
The rectum stores feces until it is ready to be released.
The anus is the opening through which feces is released.
Types of Digestion Part Mechanical Chemical Mouth Chewing Enzymes from saliva Esophagus None None (still continuing from mouth) Stomach Churning of Food Acid from gastric juice Small Intestine None Enzymes Large Intestine None Reabsorption of water and minerals
Enzymes are chemicals that speed up chemical reactions.
Enzymes used in digestion help break big things into small things.