{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Unit 7-Lecture 1.ppt - Unit 7-Digestive System Lecture...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Unit 7-Digestive System Lecture 1-Components of the Digestive System
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Introduction Food contains substances and energy the body needs to construct all cell components. The food must be broken down through digestion to molecular size before it can be absorbed by the digestive system and used by the cells. The organs that collectively perform these functions compose the digestive system.
Background image of page 2
Components Include the Gastrointestinal (GI) tract Accessory structures/glands including: teeth, tongue, salivary glands, liver, gall bladder and pancreas
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Layers of the GI tract The basic arrangement of layers in the gastrointestinal tract from the deep to superficial includes the mucosa , submucosa , muscularis , and serosa (visceral peritoneum).
Background image of page 4
Layers of the GI Tract 1. Mucosal layer 2. Submucosal layer 3. Muscularis layer 4. Serosa layer
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Mucosa Epithelium stratified squamous(in mouth,esophagus & anus) = tough simple columnar in the rest secretes enzymes and absorbs nutrients specialized cells (goblet) secrete mucous onto cell surfaces Lamina propria Layer of loose CT Muscularis mucosae thin layer of smooth muscle
Background image of page 6
Submucosa Loose connective tissue containing BV, glands and lymphatic tissue and nerve plexus
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Muscularis Skeletal muscle = voluntary control in mouth, pharynx , upper esophagus and anus control over swallowing and defecation Smooth muscle = involuntary control inner circular fibers & outer longitudinal fibers mixes, crushes & propels food along by peristalsis
Background image of page 8
Serosa An example of a serous membrane Covers all organs and walls of cavities not open to the outside of the body Secretes slippery fluid Consists of connective tissue covered with simple squamous epithelium
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
The GI Tract Oral Cavity -> pharynx -> esophagus -> lower esophageal sphincter -> stomach (cardia, fundus, body, pyrolus) -> Pyloric sphincter -> small intestine (duodenum, jejunum, ileum) -> large intestine (cecum with appendix, ascending colon, transverse colon, descending colon, sigmoid colon, rectum) -> anal sphincter -> anus
Background image of page 10
Oral Cavity (Mouth) Functions: Temporary storage of food while chewing Tasting of food Start digestion of starch by salivary amylase Chewing (mastication) of food
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Teeth Used for the mechanical breakdown of food and to articulate speech
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}