GI: Anatomy and Physiology Flashcards
Other words for GI tract:
alimentary canal, digestive tract
Chewing
Mastication
Swallowing
Deglutition
Chewing and swallowing
Ingestion
Rhythmic muscular contractions to push food
peristalsis
Process by which broken down molecules move through the intestinal tract into blood or lymph
absorption
Lining of digestive tract consisting of epithelial tissue on a layer of connective tissue
mucosa / mucous membrane
under mucosa. supplies GI tract with blood vessels and nerves
submucosa
outer wall of digestive tract below diaphragm
adventitia
inner layer of peritoneum, wrapped around visceral organs and located inside intraperitoneal space
visceral peritoneum
outer layer of peritoneum. lines the abdominopelvic cavity
parietal peritoneum
space between visceral + parietal peritoneum
peritoneal cavity
double fold of peritoneal tissue that projects from parietal peritoneum and anchors small intestine to posterior abdominal wall; supports vessels/nerves that supply the intestines
mesentery
“fatty apron”: large double fold attached to small+large intestines and stomach. hangs down like apron, consists of large fat deposits and lymph nodes.
greater omentum
hangs down to stomach and beginning of small intestine from liver.
lesser omentum
fold of peritoneum that anchors the colon to the posterior abdominal wall
mesocolon
Largest saliva gland located in tissue inferior and anterior to the ears
Parotid glands
saliva glands that lie below the jaw
submandibular glands
Saliva glands that lie below the tongue
Sublingual glands
2 components of saliva
A serous secretion containing salivary amylase (enzyme) + a mucous secretion to lubricate the oral cavity
Where swallowing takes place; approximately 4.5 to 5 inches long.
Pharynx
Part of pharynx posterior to the mouth
Oropharynx
Part of pharynx posterior to the nose
Nasopharynx
Part of pharynx that opens into larynx and esophagus
Laryngopharynx
Semisolid food after it is chewed and mixed with saliva
Bolus
Small flap of tissue which closes the larynx to prevent food from moving into lungs
Epiglottis
Sphincter at bottom of esophagus which prevents gastric juices from entering
Lower esophageal sphincter / Cardiac sphincter
Folds of mucosa and submucosa that give the stomach a wrinkled appearance
Rugae
Secrete gastric juice containing hydrochloric acid and enzymes into stomach
Gastric glands
Primary enzyme of the stomach
Pepsin
Semisolid soupy food mixture after 3-4 hours of digestion
Chyme
Exit of stomach where food is moved by peristaltic contractions
Pylorus
Sphincter found at end of stomach to prevent food regurgitating back in
Pyloric sphincter
Large elongated gland inferior to stomach. Both an exo and endocrine gland.
Pancreas
Where bile is stored.
Gallbladder
Cystic duct from gallbladder joins the duct from the liver
Common bile duct
Tube about 16 feet long by 1.5 inches in diameter that extends from stomach
Small intestine
First 22 cm of small intestine, shaped like a C. Chyme is broken down into molecules here.
Duodenum
Next 6 feet of small intestine after duodenum
Jejunum
Last part of small intestine
Ileum
Tiny fingerlike projections that increase surface area of small intestine
Villi
Glands that secrete large amounts of fluid to assist with digestion and absorption
Intestinal glands
Sphincter between small and large intestine.
Ileocecal valve
Last part of digestive system, approx 5 feet long. Water and sodium absorbed from chyme.
Large intestines
3 functions of large intestine
Absorption of sodium and water; incubation of bacteria; elimination of wastes
7 cm of large intestine where end of small and beginning of large overlap
cecum
worm-shaped tube rich in lymph tissue that extends from cecum
veriform appendix
last 12 cm of digestive tract
rectum
area between cecum and rectum
colon
cecum up to border the lowest part of the liver
ascending colon
horizontally extending across abdomen below liver and stomach
transverse colon
S-shaped emptying into the rectum
sigmoid colon
Largest, most complex organ in body. Located inferior to diaphragm.
Liver
Arteries that supply liver with blood
Hepatic arteries
Vein that delivers blood that has just received nutrients from small intestine
hepatic portal vein
cells that line hepatic sinusoids.
Kupffer cells