Digestive System Flashcards
Consists of a group of organs that break down the food into we eat into smaller molecules that can be used by body cells.
Digestive System
Continuous tube that extends from the mouth to the anus.
Gastrointestinal Tract or Alimentary Canal
This process involves taking foods and liquids into the mouth (eating).
Ingestion
Cells within the walls of the GI tract and accessory digestive organs secrete a total of about 7 liters of water, acid, buffers, and enzymes into the lumen (interior space) of the tract.
Secretion
Alternating contractions and relaxations of smooth muscle in the walls of the GI tract mix food and secretions and move them toward the anus.
Motility
This capability of the GI tract to mix and move material along its length is called _______.
Motility
______ is the process of breaking down ingested food into small molecules that can be used by body cells.
Digestion
The movement of the products of digestion from the lumen of the GI tract into blood or lymph is called _______.
Absorption
Wastes, indigestible substances, bacteria, cells sloughed from the lining of the GI tract, and digested materials that were not absorbed in their journey through the digestive tract leave the body through the anus in a process called ________.
Defecation
The eliminated material is termed _________.
Feces or stool
Regions of the digestive system can be divided into two main parts:
Alimentary tract and accessory organs
Length in the living: 5-7 meters; cadaver length: 7-9 meters
Gastrointestinal Tract or Alimentary Canal
include the teeth, tongue, salivary glands, liver, gallbladder, and pancreas.
Accessory Digestive Organs
Alimentary Tract of the Digestive System
mouth
pharynx and esophagus
stomach
small and large intestine
Alimentary Tract of the Digestive System
Salivary Glands
Liver
Gallbladder
Pancreas
The innermost tunic of the wall of digestive tract.
Mucosa or mucous membrane
It lines the lumen of the digestive tract.
Mucosa
The mucosa consists of epithelium, an underlying loose connective tissue layer called __________, and a thin layer of smooth muscle called the ________.
lamina propria, muscularis mucosa
A thick layer of loose connective tissue that surrounds the mucosa.
Submucosa
This layer also contains blood vessels, lymphatic vessels, and nerves.
Submucosa
Glands may be embedded in this layer of digestive tract.
Submucosa
These layers of smooth muscle are used for peristalsis (rhythmic waves of contraction), to move food down through the gut.
Muscular layer
Outermost layer of loose connective tissue - covered by the visceral peritoneum.
Serous layer or serosa
Contains blood vessels, lymphatics and nerves.
Serous layer or serosa
also referred to as the oral or buccal cavity, is formed by the cheeks, hard and soft palates, and tongue.
Mouth
The first part of the digestive tract.
Mouth
It is adapted to receive food by ingestion, break it into small particles by mastication, and mix it with saliva.
Mouth
Form the lateral walls of the oral cavity.
Cheeks