The digestive system is composed of a long tube called the alimentary canal and the accessory organs including the liver, pancreas, and gall bladder. The alimentary canal starts at the mouth, includes the esophagus, stomach, intestines, and rectum and terminates at the anus. It can be defined as the tube through which ingested products move. The accessory organs have digestive functions but they do not come into contact with material passing through the digestive tract. The alimentary canal consists of numerous organs including the mouth which is the opening to the system and is directly anterior to the oral cavity. The terminal aspect of the oral cavity is defined by the small mass of fleshy tissue called the uvula. Posterior to the oral cavity is the oropharynx. This chamber receives food and liquid from the mouth and air from both the mouth and nasal cavity. The oropharynx leads to the esophagus which is a muscular tube that takes ingested material to the stomach. The stomach is a storage organ leading to the small intestine where material is digested and absorbed. The large intestine receives material from the small intestine, removes a significant amount of water, and stores the fecal material prior to defecation.
The salivary glands are the most superior accessory glands. They lubricate food and add digestive enzymes to material that is swallowed. The liver, pancreas and gallbladder all add secretions to the ingested material and aid in the digestive process. Label the parts of the digestive system, including the alimentary canal and the accessory organs, and color the individual digestive organs a different color.
Answer Key: a. Alimentary canal, b. Mouth, c. Esophagus, d. Stomach, e. Small intestine, f. Large intestine, g. Accessory organs, h. Salivary glands, i. Liver, j. Pancreas, k. Gall bladder, I. Rectum, m. Anus
Chapter Eleven I karlait-. Digestive System | medical
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