SIUE BIOL 240B Exam 3: Digestive
Part Questions and All Correct
Answers.
Digestive system - Answer -Provides nutrients for maintenance and growth
-Muscular tube
-supports tissues with no direct contact with the outside environment
Digestive tract - Answer -continuous tube from mouth to anus
-muscular tube lined with mucous epithelium
-contains permanent ridges and temporary folds to increase surface area
Accessory organs - Answer Secrete products into digestive tract
Mesentery - Answer -double sheets of peritoneal membrane
-Areolar connective tissue lies between layers to provide a route for blood vessels, nerves,
lymphatics
-Stabilizes attached organs and prevents entanglement of intestines
Four major layers - Answer Mucosa, submucosa, muscularis, serosa
Mucosa - Answer -inner lining
-contained mucus epithelium moistened by glandular secretions and laminapropria of aerial art
tissue
Submucosa - Answer -dense irregular connective tissue
-Blood Vessels and Lymphatic vessels
-Exocrine glands in some regions jump externally into lumen of digestive system, secrete buffers
in enzymes into tract
Muscularis layer - Answer -two smooth muscle layers
-Mechanical processing and movement
Serosa - Answer -outer most layer
-visceral peritoneum along digestive tract in abdominal cavity
, Components of mucosa - Answer Mucosal epithelium, villi, lamina propria, muscularis
mucosae
Mucosal epithelium - Answer -tract begins and ends with stratified squamous
-Stomach, small/large intestine contains simple columnar with goblet cells
Villi (mucosa) - Answer Small mucosal projections to increase surface area for absorption
Lamina propria (mucosa) - Answer Areolar tissue containing blood vessels, sensory nerve
endings, lymphatic vessels, smooth lymphoid tissue, and some mucous glands
Muscularis mucosae - Answer -two concentric layers of smooth muscle
-alter shape of lumen, move circular folds and villa
Circular folds - Answer Permanent transverse folds in intestinal lining
Nerve plexus - Answer -Local control of digestive activities
-parasympathetic stimulation increases the digestive muscle tone in activity
-sympathetic stimulation decrease muscle tone and activity
Submucosal nerve plexus - Answer Innervates mucosa and submucosa, controls secretion
Myenteric plexus - Answer Muscularis externa between circular and longitudinal layers that
controls gut motility
Smooth muscle (body) - Answer Forms sheets, bundles, or sheaths around tissues called
sphincters that regulate movement along passage ways, found in vascular, digestive and urinary
systems
Smooth muscle (digestive) - Answer Organized into inner circular layer in outer longitude a
layer, within layers cells are aligned parallel to each other
Smooth muscle contraction - Answer Contraction involves interaction of thin and thick
filaments, cells shortens but not in a straight line, twist like a corkscrew as a contracts
Peristalsis - Answer -wave of muscular contraction
Part Questions and All Correct
Answers.
Digestive system - Answer -Provides nutrients for maintenance and growth
-Muscular tube
-supports tissues with no direct contact with the outside environment
Digestive tract - Answer -continuous tube from mouth to anus
-muscular tube lined with mucous epithelium
-contains permanent ridges and temporary folds to increase surface area
Accessory organs - Answer Secrete products into digestive tract
Mesentery - Answer -double sheets of peritoneal membrane
-Areolar connective tissue lies between layers to provide a route for blood vessels, nerves,
lymphatics
-Stabilizes attached organs and prevents entanglement of intestines
Four major layers - Answer Mucosa, submucosa, muscularis, serosa
Mucosa - Answer -inner lining
-contained mucus epithelium moistened by glandular secretions and laminapropria of aerial art
tissue
Submucosa - Answer -dense irregular connective tissue
-Blood Vessels and Lymphatic vessels
-Exocrine glands in some regions jump externally into lumen of digestive system, secrete buffers
in enzymes into tract
Muscularis layer - Answer -two smooth muscle layers
-Mechanical processing and movement
Serosa - Answer -outer most layer
-visceral peritoneum along digestive tract in abdominal cavity
, Components of mucosa - Answer Mucosal epithelium, villi, lamina propria, muscularis
mucosae
Mucosal epithelium - Answer -tract begins and ends with stratified squamous
-Stomach, small/large intestine contains simple columnar with goblet cells
Villi (mucosa) - Answer Small mucosal projections to increase surface area for absorption
Lamina propria (mucosa) - Answer Areolar tissue containing blood vessels, sensory nerve
endings, lymphatic vessels, smooth lymphoid tissue, and some mucous glands
Muscularis mucosae - Answer -two concentric layers of smooth muscle
-alter shape of lumen, move circular folds and villa
Circular folds - Answer Permanent transverse folds in intestinal lining
Nerve plexus - Answer -Local control of digestive activities
-parasympathetic stimulation increases the digestive muscle tone in activity
-sympathetic stimulation decrease muscle tone and activity
Submucosal nerve plexus - Answer Innervates mucosa and submucosa, controls secretion
Myenteric plexus - Answer Muscularis externa between circular and longitudinal layers that
controls gut motility
Smooth muscle (body) - Answer Forms sheets, bundles, or sheaths around tissues called
sphincters that regulate movement along passage ways, found in vascular, digestive and urinary
systems
Smooth muscle (digestive) - Answer Organized into inner circular layer in outer longitude a
layer, within layers cells are aligned parallel to each other
Smooth muscle contraction - Answer Contraction involves interaction of thin and thick
filaments, cells shortens but not in a straight line, twist like a corkscrew as a contracts
Peristalsis - Answer -wave of muscular contraction
