Vocabulary

digestion gastrointestinal tract saliva pharynx epiglottis peristalsis gastric fluid ulcer cardiac sphincter chyme pyloric sphincter gallbladder villus colon figure 48-6

The digestive system is made up of the gastrointestinal tract, salivary glands, the liver, gallbladder, and pancreas. These organs break down food into nutrients that can be absorbed into the bloodstream.

figure 48-7

Saliva is produced by three sets of glands located near the mouth. The set closest to the ear is the target of the virus that causes mumps.

figure 48-8

The pharynx is the only passage shared by the digestive and respiratory systems. Notice how the epiglottis can close off the trachea so that food can pass only down the esophagus.

The pharynx is the only passage shared by the digestive and respiratory systems. Notice how the epiglottis can close off the trachea so that food can pass only down the esophagus.

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