Procedure Esmall And Large Intestines

1. Review textbook sections on the small intestine and large intestine.

2. As a review activity, label figure 49.10.

3. Observe the torso, and locate each of the following features:

Features Associated With The Pharynx
Figure 49.5 Label the features associated with the pharynx.
Label Large Intestin
Figure 49.6 Label the major regions of the stomach and associated structures.
Anatomy The Large Intestine Humans

Figure 49.7 Label the lining of the stomach by placing the correct numbers in the spaces provided.

Large Intestines Human

Chief cell Gastric gland Gastric pits Mucosa Mucous cell Parietal cell Submucosa

Human Large Intestine AnatomyEpiploic Appendage

small intestine duodenum jejunum ileum mesentery ileocecal sphincter (valve) large intestine large intestinal wall haustra teniae coli epiploic appendages cecum vermiform appendix ascending colon right colic (hepatic) flexure transverse colon left colic (splenic) flexure descending colon sigmoid colon rectum anal canal anal columns anal sphincter muscles internal anal sphincter external anal sphincter anus

4. Examine a microscopic section of small intestine wall using low-power magnification. Identify the mucosa, submucosa, muscular layer, and serosa. Note the villi that extend into the lumen of the tube. Study a single villus using high-power magnification. Note the core of connective tissue and the covering of simple columnar epithelium that contains some lightly stained goblet cells (fig. 49.11). What is the function of these villi?_

5. Examine a microscopic section of large intestine wall. Note the lack of villi. Also note the tubular mucous glands that open on the surface of the

Figure 49.11 Micrograph of the inner duodenal wall (100x).

Human Duodenum Mucosa 100xInner Intestines

inner lining and the numerous lightly stained goblet cells. Locate the four layers of the wall (fig. 49.12). What is the function of the mucus secreted by these glands?_

Critical Thinking Application

How is the structure of the small intestine better adapted for absorption than the large intestine?

Critical Thinking Application

How is the structure of the small intestine better adapted for absorption than the large intestine?

6. Complete Part E of the laboratory report.

Web Quest

Summarize the functions of the organs of the digestive system. Search these at http://www.mhhe.com/biosci/abio/ martinlmwq.mhtml

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Responses

  • Basso
    How is the structure of the small intestine better adapted for absorption than the large intestine?
    4 years ago
  • Razanur
    How is the structure of the small intestines better adapted for absorption than the large intestine?
    4 years ago

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