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14 Cards in this Set
- Front
- Back
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Layers of the Alimentary Canal
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Mucosa
Submucosa Muscularis Serosa (Adventitia) |
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Which are the components of the digestive system?
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A. DIGESTIVE TRACT (ORAL CAVITY, ESOPHAGUS, STOMACH, SMALL AND LARGE INTESTINES, RECTUM AND ANUS)
B. ASSOCIATED GLANDS (SALIVARY GLANDS, LIVER AND PANCREAS) |
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WHAT ARE THE FUNCTIONS OF THE DIGESTIVE SYSTEM?
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A. ABSORPTION OF NUTRIENTS
B. PROTECTIVE BARRIER |
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WHERE AND HOW DOES THE DIGESTION PROCESS OCCUR?
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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 |
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Which are the two layers of the Mucosa of the Digestive Tract?
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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 |
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WHAT ARE THE FUNCTIONS OF THE EPITHELIAL LINING OF THE MUCOUS MEMBRANE IN THE DIGESTIVE TRACT?
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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 |
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Submucosa of Alimentary Canal in digestive tract
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Dense Connective Tissue
Meissner Plexus Glands and Lymphoid Tissues |
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Muscularis Layer of Alimentary Canal
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SMOOTH MUSCLE CELLS
*Internal Sublayer: Circular *External Sublayer: Longitudinal MYENTERIC NERVE PLEXUS (AUERBACH'S) *Regulates the activity of the mucosa *Peristalsis |
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Serosa (Adventitia) of Alimentary Tract
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Loose Connective Tissue
Adipose Tissue Simple Squamous covering epithelium Retroperitoneal: Adventitia (Bound to other organs) Intraperitoneal: Serosa |
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Where are lymph nodes abundant in the digestive tract?
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LAMINA PROPIA
*Rich in Macrophages *Rich in Lymphoid Cells: Produces IgA (resistant ot proteolytic enzymes) SUBMUCOSAL LAYER |
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ESOPHAGUS
*Distal End _____________ *Mid Portion _____________ *Proximal End _____________ |
Smooth Muscle Cells
Striated and Smooth Striated |
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Function of Esophagus
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To convey a bolus of food from the pharynx into the stomach by peristaltic activity of the muscularis externa.
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Sphincters on the muscularis externa of the Esophagus
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Pharyngoesophageal
Gastroesophageal |
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ESOPHAGOUS GLANDS
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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 |
