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Chapter 24
The Digestive System
27
Anatomy
Undergraduate 1
11/14/2013

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Term

Anabolism

Definition

When substance are used for raw materials for synthesizing essential compounds.

 

Term
Catabolism
Definition
When substances are decomposed to provide the energy that cells need to continue functioning.
Term
Catabolic reactions
Definition

require:

1. Oxygen

2. Organic molecules

-carbs

-fats

-proteins

Term
Digestive System
Definition

1. Digestive Tract

(gastrointestinal tract)

2. Accessory organs

Term
Digestive tract
Definition

-Oral Cavity

-Pharynx

-Esophagus

-Stomach

-Small Intestine

-Large Intestine

Term
Accessory Digestive Organs
Definition

1. Teeth

2. Tongue

3. Glandular organs

-salivaryglands

-liver

-pancreas

 

Term
Digestion
Definition
Chemical breakdown of food into small organic fragments suitable for absorption by the epithelium
Term
Secretion
Definition
The release of water, acids, enzymes, buffers, and salts by the epithelium of the digestive tract and the glandular organs
Term
Absorption
Definition
movement of organic substrates, electrolytes, vitamins, and water across the digestive epithelium and in to the interstitial fluid of the digestive tract.
Term
Excretion
Definition
The removal of waste products from body fluids.
Term

Defecation

(egestion)

Definition
The ejection of materials from the digestive tract.
Term
Lining of the digestive tracts role:
Definition

Safeguard surrounding tissue against:

1. corrosive effects of digestive acids & enzymes

2. mechanical stresses

3. bacteria (from food or in digestive tract)

Term
Peritoneal cavity
Definition

-In the abdominopelvic cavity

-Peritoneal fluid seperates the parietal and visceral surfaces

-relative movement can occur without friction

Term
Ascites
Definition
Accumulation of fluid in the peritoneal cavity that creates a characteristic abdominal swelling.
Term
Mesenteries
Definition

Sheets of serous membrane that connect the patietal peritoneum with the visceral peritoneum.

Portions of digestive tract are suspended within the peritoneal cavity by it.

Double sheets of peritoneal membrane.

Stabilize the position of attached organs.

Term
Lesser omentum
Definition
Stabilizes the position of the stomach and provides an access route for blood vessels and other structures entering or leaving the liver.
Term
Falciform ligament
Definition
Helps stabilize the position of the liver relative to the diaphragm and abdominal wall.
Term
Greater omentum
Definition
Hangs like an apron from the lateral and inferior borders of the stomach.
Term
Mesocolon
Definition
A mesentery associated with a portion of the large intestine.
Term
Transverse mesocolon
Definition
supports the transverse colon
Term
Sigmoid mesocolon
Definition
supports the sigmoid colon
Term
Peritonitis
Definition

Inflammation of the peritoneal membrane. A painful condition that interferes with the normal functioning of the affected organs.

Physical damage, chemical irritation, and bacterial invasion of the peritoneum can lead to severe and even fatal cases of peritonitis.

Term
Major layers of the DIGESTIVE TRACT
Definition

1. Mucosa

2. submucosa

3. muscularis externa

4. serosa

Term
Mucosa
Definition

Inner lining of the digestive tract.

A mucous membrane consisting of an epithelium, moistened by glandular secretions, and a lamina propria of areolar tissue.

Term
Stratified squamous epithelium
Definition
ine the oral cavity, pharynx, and esophagus
Term
Simple columnar epithelium
Definition

contain goblet cells.

line the stomach, small intestine, and almost the entire length of the large intestine.

Term
Enteroendocrine cells
Definition

Among the columnar cells.

Secrete hormones that coordinate the activities of the digestive tract and the accessory glands.

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