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Cellular Resp. THE DIGESTIVE SYSTEM Divided into two parts: · Alimentary
tract o Or Gastrointestinal tract o Hollow tube from mouth ...
... to determine the significance of the differences – Friedman ANOVA and Wilcoxon,
resp. ... Lymphocyte subset and cellular immune responses to a brief experimental ...
Submitted by ccsykes on April 4, 2005
Category: Science
Words: 3849 | Pages: 16
Views: 343
Popularity Rank: 27,087
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THE DIGESTIVE SYSTEM
Divided into two parts:
· Alimentary tract
o Or Gastrointestinal tract
o Hollow tube from mouth to anus
o Food material inside the tract is considered to be outside the body b/c the canal is open to the external environment at both ends
o It digests food and absorbs the digested fragments
o Organs include
§ Mouth
§ Pharynx
§ Esophagus
§ Stomach
§ Small intestine
§ Large intestine
· Accessory digestive organs
o Organs include
§ Teeth
§ Tongue
§ Gall bladder
§ Salivary glands
§ Liver
§ Pancreas
o The teeth and tongue are in the oral cavity while digestive glands and gallbladder lie outside the GI tract and connect to it by ducts
o Most of the accessory digestive organs are in the abdomino-pelvic cavity
§ Covered by a serous membrane called the visceral peritoneum
§ Parietal peritoneum covering the abdominal walls of the abdomino-pelvic cavity
§ B/w these two layers is a thin layer of fluid produced by the serous membranes
· Lubricates b/c these organs are moving
§ Organs are held in place, and anchored to the abdominal wall (b/c they are moving) by mesentery
· A double layer of peritoneum
o Sheet of two serous membranes fused back to back that extends to the digestive organs from the body wall
· Also a fat storage area
· Provide routes for blood vessels, lymphatics and nerves to reach the digestive viscera
GI tract
· Hollow tube w/ 4 distinct layers
o Central is the hollow portion called the lumen
o Mucosa
§ Layer closest to the lumen
§ Wet epithelial membrane (simple columnar epithelium)
§ Often w/ a lot of goblet cells to secret mucous
· Mucous lubricates food to help it pass through the canal
· Mucous lining protects the wall of the...
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