overiew of GI Flashcards
What type of cells handle digestion?
exocrine epithelial
smooth muscle
what type of cells handle absorption?
absorptive epithelial
True or False. . Taste buds can distinguish 12 different tastes.
False. 6
Salivary glands secrete what exocrine enzyme?
amylase
Which third of the esophagus is responsible for peristaltic contractions?
lower 2/3 (smooth muscle)
a patient presents with heartburn and sour taste in mouth when lying down, what could possibly be causing this?
GERD. LES (lower esophageal sphincter fails to fully close)
What is are 2 substance important for protein digestion?
pepsin (from chief cells)
HCl (parietel epitheleal cells)
What is gastric lipase?
secreted by fundic chief cells continues lipid digestion initiated by lingual lipase
True or False. Dietary nutrients are absorbed in the stomach?
False. NO mucosal absorptive cells of small intestines
what is the longest part of small intestine?
ileum - 14 feet
What is the only steroid associated with GI degestion that is secreted via the endocrine system?
aldosterone (from adrenal cortex)
True or False: Parasympathetic extrinsic fibers largely DEPRESSES GI secretion and motility
False: EHANCES
True for False. Somatic Nervous System fibers do NOT have ganglion.
True
The following enzymes hyrolyze what?
lipases
disaccharidases
proteases
lipase — fat to monoglycerides and fatty acid
disaccharidases – Carbs to monosacharides
poteases — PRO to amino acids and small peptides
why is there no gut transport maxium?
a) there is excess transport capacity (small intestine ~ 20 ft long), and
b) flow through the GI tract is regulated by regulation of stomach and
small intestinal motility to promote absorption of the entire meal.