Chapter 23 - Structures of the Digestive System Structures...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Structures of the Digestive System • Structures of the digestive system divided into two groups Gastrointestinal tract (GI tract) • The pathway from the mouth to the anus • Most organs of the GI tract protected by a membranous covering called the peritoneum Accessory digestive organs • Organs involved in grinding food or providing digestive secretions
Background image of page 1

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

View Full DocumentRight Arrow Icon
Structures of the Digestive System The Gastrointestinal Tract – Digests food, absorbs nutrients and water into the blood, and eliminates waste – Components of the gastrointestinal tract Mouth – site where food is moistened and chewed Esophagus – tube leading to the stomach Stomach – secretes chemicals that work to digest foods Small intestine – responsible for the majority of digestion and absorption of nutrients Large intestine (colon) – completes absorption of nutrients and water Rectum and anus – store and eliminate waste
Background image of page 2
Structures of the Digestive System The Accessory Digestive Organs – Components of the accessory digestive system Tongue and teeth – chew food into small pieces Salivary glands – secrete saliva that moistens food to allow it be swallowed Liver – neutralizes or removes harmful substances from the body and produces bile that aids in digestion Gallbladder – concentrates and stores bile that is made in the liver Pancreas – produces pancreatic juice that neutralizes stomach acid as it enters the intestine and further digests food
Background image of page 3

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

View Full DocumentRight Arrow Icon
Structures of the Digestive System
Background image of page 4
Normal Microbiota of the Digestive System Esophagus, Stomach, Duodenum – These regions are almost free of microbes – Peristalsis and the rapid transport of food helps prevent colonization by microbes Tongue, Teeth, Jejunum, Ileum, Colon, Rectum – Tongue and teeth Viridans streptococci are most prevalent in this region – Lower small intestine and colon Microbiota here are microbial antagonists • Mucous membrane prevents microbes entering the bloodstream
Background image of page 5

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

View Full DocumentRight Arrow Icon
Bacterial Diseases of the Digestive System Dental Caries, Gingivitis, and
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/24/2011 for the course BIO 119 taught by Professor Stevendroho during the Spring '11 term at Moraine Valley Community College.

Page1 / 30

Chapter 23 - Structures of the Digestive System Structures...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online