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14 Cards in this Set

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Layers of the Alimentary Canal
Mucosa
Submucosa
Muscularis
Serosa (Adventitia)
Which are the components of the digestive system?
A. DIGESTIVE TRACT (ORAL CAVITY, ESOPHAGUS, STOMACH, SMALL AND LARGE INTESTINES, RECTUM AND ANUS)
B. ASSOCIATED GLANDS (SALIVARY GLANDS, LIVER AND PANCREAS)
WHAT ARE THE FUNCTIONS OF THE DIGESTIVE SYSTEM?
A. ABSORPTION OF NUTRIENTS
B. PROTECTIVE BARRIER
WHERE AND HOW DOES THE DIGESTION PROCESS OCCUR?
A. MOUTH IS MOISTENED BY SALIVA AND GROUND BY TEETH INTO SMALLER PIECES; SALIVA ALSO INITIATES THE DIGESTION OF CARBOHYDRATES
B. STOMACH AND SMALL INTESTINE: FOOD IS TRANSFORMED INTO ITS BASIC COMPONENTS AND ARE ABSORBED. WATER ABSORPTION OCCURS IN THE LARGE INTESTINE
Which are the two layers of the Mucosa of the Digestive Tract?
A. Epithelial Lining consisting of a LAMINA PROPIA of LOOSE CONNECTIVE TISSUE rich in blood and LYMPH VESSELS, SMOOTH MUSCLE CELLS, GLANDS, AND LYMPHOID TISSUE
B. MUSCULARIS MUCOSAE: INNER CIRCULAR LAYER AND OUTER LONGITUDINAL LAYER OF SMOOTH MUSCLE CELLS
WHAT ARE THE FUNCTIONS OF THE EPITHELIAL LINING OF THE MUCOUS MEMBRANE IN THE DIGESTIVE TRACT?
1. ACT AS A PERMEABLE BARRIER
2. FACILITATE TRANSPORT AND DIGESTION OF FOOD
3. PROMOTE THE ABSORPTION OF THE PRODUCTS OF DIGESTION
4. PRODUCE HORMONES THAT AFFECT THE ACTIVITY OF THE DIGESTIVE SYSTEM
Submucosa of Alimentary Canal in digestive tract
Dense Connective Tissue
Meissner Plexus
Glands and Lymphoid Tissues
Muscularis Layer of Alimentary Canal
SMOOTH MUSCLE CELLS
*Internal Sublayer: Circular
*External Sublayer: Longitudinal
MYENTERIC NERVE PLEXUS (AUERBACH'S)
*Regulates the activity of the mucosa
*Peristalsis
Serosa (Adventitia) of Alimentary Tract
Loose Connective Tissue
Adipose Tissue
Simple Squamous covering epithelium
Retroperitoneal: Adventitia (Bound to other organs)
Intraperitoneal: Serosa
Where are lymph nodes abundant in the digestive tract?
LAMINA PROPIA
*Rich in Macrophages
*Rich in Lymphoid Cells: Produces IgA (resistant ot proteolytic enzymes)
SUBMUCOSAL LAYER
ESOPHAGUS
*Distal End _____________
*Mid Portion _____________
*Proximal End _____________
Smooth Muscle Cells
Striated and Smooth
Striated
Function of Esophagus
To convey a bolus of food from the pharynx into the stomach by peristaltic activity of the muscularis externa.
Sphincters on the muscularis externa of the Esophagus
Pharyngoesophageal
Gastroesophageal
ESOPHAGOUS GLANDS
A. Esophageal Glands
*Mucus secreting
*Submucosa
*Facilitates the transport of foodstuff
*Protects Mucosa
B. Esophageal CARDIAC Glands
^Located at the LAMINA PROPIA NEAR the STOMACH
^Secretes Mucus