A&P Chapter #23 - 1
Card Set Information
A&P Chapter #23 - 1
___ material enters through the mouth
___ takes place after ingestion, via action of the tongue, teeth/jaw motions, muscular movement of the digestive tract (chewing, segmentation, churning)
___ swallowing, peristalisis
___ is the actual breakdown of food, into molecules that can be absorbed by the digestive epithelium
___ requires acids, enzymes, buffers for reactions to occur, process of SECRETION supplies these essentials
___ : movement of substances across digestive epithelium to interstitial space (includes organic molecules, electrolytes (ions), vitamins, water)
___ : dehydrate indigestible material
___ : discharge of fecal material
___ exists as a 3-Dimensional structure, functions to increase surface area available for absorption.
___ Cells in areas where mechanical stresses are greatest Ex.) oral cavity, pharynx, esophagus, rectum, anus.
___ Cells in the remainder of the GI tract, where secretory cells are common.
___ Two-layered smooth muscle structure (one circular arrangement next to sm. muscle in longitudinal arrangement) Will alter lumen shape, move folds.
___ A connective tissue layer (+ blood vessels, nerves, lymphatic tissue, smooth muscle)
EPITHELIUM + L.PROPRIA + MUSCLARIS MUCOSAE = ___
MUCOUS MEMBRANE (Mucosa)
___ A connective tissue layer (second), same composition as the lamina propria
Submucosa surrounds muscularis mucosae that may contain ___ (buffers, enzymes, acids)
Submucosa contains sensory nerve fibers = ___(PNS and SNS fibers)
___ smooth muscle structure circular inner layer and longitudinal outer layer
___ Role in moving bolus of food through GI tract
Muscularis Externa movements are controlled by ___ that lies between the two sm. muscle layers.(parasympathetic will increase muscle activity/tone, while the sympathetic input will inhibit contraction, relaxation results)
___ Loose connective tissue layer surrounds mus. externa.
@ oral cavity/esophogus/rectum the adventitia is attached to adjacent structures via dense ___
@ areas of GI tract within the peritoneal cavity, the adventitia is covered by the ___
serosa (visceral peritoneum)
___ Serous membranes, secrete serous fluid(lubricates, decrease friction), A cavity exists between 2
Peritoneum on organ ___
___ lines peritoneal cavity
Folded extensions of the visceral and parietal peritoneum.
Double sheets of the peritoneum, often have a role in suspending parts of the digestive tract.
Non Striated (no sarcomeres),Spindle Shape cell,Single Nucleus, Actin & Myosin protein filaments exists.
Smooth Muscle of Digestive Tract
Initiation of contraction begins as the lekage of Ca2 into ___
Myosin Light Chain Kinase
Once an interaction between actin & myosin occurs sliding results and cell shortens causing ___
___ of certain muscularis regions of the GI tract will undergo spontaneous depolarization, leading to contraction
___ will result from local stimuli, i.e.sensory receptors in the walls of the tract trigger a local contraction (region of a few cm)
Contractions may be initiated by fibers of the
Vagus, Glossopharyngeal, Pelvic nerves
GI tract Contraction - effects of Parasympathetic activity ___
GI tract Contraction - effects of Sympathetic activity ___
The movement of materials from one part of the GI tract to another via muscularis externa contractions ___
The contractions occur in a specific order ___
circular muscles first followed by longitudinal muscles
The sm.intestine exhibit ___ movement