Flashcards in Digestive System Deck (128)
What is another name for the GI tract?
List the main organs in the digestive system
mouth, pharynx, esophagus, stomach, small intestine, and large intestine
List the accessory digestive organs
teeth, tongue, gallbladder, salivary glands, liver, and pancreas
In order, what are the main stages in the digestive process?
2. Mechanical breakdown
Which step in the digestive process are swallowing and peristalsis apart?
alting waves of contraction and relaxation
Which 3 components constituent mechanical breakdown?
chewing, churning, and segmentation
What is segmentation?
rhythmic local constrictions of small intestine
Passage of digested end products from GI tract lumen into blood or lymph
Elimination of indigestible substances
What controls GI tract motility and secretion?
Enteric nervous system
What provokes digestive activity?
mechanical and chemical stimuli
When stimulated, receptors in GI tract walls initiate reflexes that...?
1. activate/inhibit digestive glands
2. stimulate smooth muscle
T or F. Controls of digestive activity are both intrinsic and extrinsic
What are the 2 neural mechanisms?
1. Short reflexes- GI tract
2. Long reflexes- CNS center and ANS fibers
Describe hormonal mechanisms.
involve hormone-producing cells in stomach and small intestine
What covers the abdomen?
What type of peritoneum covers the organs?
What comes between visceral and parietal peritoneum?
What type of peritoneum lines the abdominopelvic cavity?
What is the double layer of peritoneum that extends to digestive organs from body wall?
What are the 4 layers of the alimentary canal?
muscosa, submucosa, muscularis externa, and serosa
Which layer of the alimentary canal consist of epithelium, lamina propria, and muscularis externa?
Dense connective tissue; contains blood vessels, lymphatics, and nerve fibers
Inner circular layer; outer longitudinal layer
Bounded by lips, cheeks, palate, and tongue; lines by stratified squamous epithelium
Mouth (oral cavity)
Bone in the oral cavity