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Digestive system Biology 104

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Biology 104 Human Digestive System Anatomy Objectives: 1. Learn the anatomy of the digestive system. You should be able to find all terms in bold on the human torso models. 2. Relate structure of the system to some of its functions. I. Introduction: Some terms used to describe the relative positions of body parts are used repeatedly throughout the lab, and appear in a glossary at the end of this exercise. II. a. EXTERNAL ANATOMY The trunk of mammals is divided into a thorax, which is bordered by ribs, and an abdomen. Most of the digestive system is within the abdomen, but the head, neck, and thorax contain the superior end of the digestive system. II. b. DIGESTIVE SYSTEM The digestive system includes the alimentary canal or gastrointestinal tract, a tubular, muscle-lined passageway that extends from the mouth to the anus. The muscles in the walls of the passage way are responsible for peristalsis. You will view the regions along this tube that are specialized for various activities of the digestive system. Path of Air Since the paths of air and food are closely associated, let's also trace the path of air through the head and neck. When the mouth is closed, air enters the body through the external nares or nostrils. The external nares lead to a chamber dorsal to the hard palate, called the nasal cavity. Air then passes from the nasal cavity to the nasopharynx, which is a chamber dorsal to the soft palate. Only mammals have a hard palate, which separates the breathing and ea ...
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