![]() Just past the pyloric sphincter, it bends posteriorly behind the peritoneum, becoming retroperitoneal, and then makes a C-shaped curve around the head of the pancreas before ascending anteriorly again to return to the peritoneal cavity and join the jejunum. ![]() The shortest region is the 25.4-cm (10-in) duodenum, which begins at the pyloric sphincter. From proximal (at the stomach) to distal, these are the duodenum, jejunum, and ileum (Figure 1). The coiled tube of the small intestine is subdivided into three regions. This large surface area is necessary for complex processes of digestion and absorption that occur within it. As we’ll see shortly, in addition to its length, the folds and projections of the lining of the small intestine work to give it an enormous surface area, which is approximately 200 m 2, more than 100 times the surface area of your skin. Since this makes it about five times longer than the large intestine, you might wonder why it is called “small.” In fact, its name derives from its relatively smaller diameter of only about 2.54 cm (1 in), compared with 7.62 cm (3 in) for the large intestine. The longest part of the alimentary canal, the small intestine is about 3.05 meters (10 feet) long in a living person (but about twice as long in a cadaver due to the loss of muscle tone). Not only is this where most digestion occurs, it is also where practically all absorption occurs. In addition, called the small and large bowel, or colloquially the “guts,” they constitute the greatest mass and length of the alimentary canal and, with the exception of ingestion, perform all digestive system functions.Ĭhyme released from the stomach enters the small intestine, which is the primary digestive organ in the body. The word intestine is derived from a Latin root meaning “internal,” and indeed, the two organs together nearly fill the interior of the abdominal cavity. Trace the pathway of food waste from its point of entry into the large intestine through its exit from the body as feces.Identify the beneficial roles of the bacterial flora in digestive system functioning.List three features unique to the wall of the large intestine and identify their contributions to its function.Describe the mechanical and chemical digestion of chyme upon its release into the small intestine.Identify three main adaptations of the small intestine wall that increase its absorptive capacity.Compare and contrast the location and gross anatomy of the small and large intestines.Section 14 - Special Senses Toggle Dropdownīy the end of this section, you will be able to:. ![]() Chapter 44 - Development of the Male and Female Reproductive Systems.Chapter 43 - Anatomy and Physiology of the Female Reproductive System.Chapter 42 - Anatomy and Physiology of the Male Reproductive System.Section 13 - Reproductive System Toggle Dropdown.Chapter 40 - Divisions of the Skeletal System.Section 12 - Skeletal System Toggle Dropdown.Chapter 39 - Muscle Fiber Contraction and Relaxation.Section 11- Muscular System Toggle Dropdown. ![]() Chapter 35 - An Overview of the Endocrine System.Section 10 - Endocrine System Toggle Dropdown.Chapter 33 - Basic Structure and Function of the Nervous System.Section 9 - Nervous System Toggle Dropdown.Chapter 32 - The Urinary System and Homeostasis.Chapter 31 - Gross Anatomy of the Kidney.Section 8 - Urinary System Toggle Dropdown.Chapter 29 - Organs and Structures of the Respiratory System.Section 7 - Respiratory System Toggle Dropdown.Chapter 26 - The Adaptive Immune Response: B-lymphocytes and Antibodies.Chapter 25 - The Adaptive Immune Response: T-lymphocytes and Their Functional Types.Chapter 24 - Barrier Defenses and the Innate Immune Response.Section 6 - Circulatory-Immune System Toggle Dropdown.Chapter 20 - Chemical Digestion and Absorption.Chapter 19 - Accessory Organs in Digestion.Chapter 18 - The Small and Large Intestines.Chapter 16 - Digestive System Processes and Regulation.Chapter 15 - Accessory Structures of the Skin.Section 4 - Integumentary System Toggle Dropdown.Chapter 13 - Connective Tissue Supports and Protects.Chapter 12 - Nervous Tissue Mediates Perception and Response.Chapter 4 - Inorganic Compunds Essential to Human Functioning.Chapter 3 - Organic Compounds Essential to Human Functioning.Section 1 - Chemistry of Life Toggle Dropdown.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |