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Vertebrates, arthropods, & mollusks represent 3 important digestive…
Vertebrates, arthropods, & mollusks represent 3 important digestive-absorptive plans
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principal mech by which food and other materials are moved along as they pass thru the digestive systems ad vests
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Peristalsis
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highly coordinated pattern of contraction in which constriction of the gut at one point on its length initiates constriction at a neighboring point farther along, producing a "wave" of constriction that moves progressively along the gut, propelling food material before it
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Segmentation
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"constrictions of circular muscles appear and disappear in patterns that push the gut contents back and forth"
control depends principally on the enteric nervous system, a network of nerve cells w/in the gut walls
GUT MOTILITY - general term that refers to peristalsis, segmentation, or other muscular activity by the gut in vertebrates/ invertebrates
arthropods resemble verts in that digestion is chiefly extracellular, and food is moved thru the digestive tract by muscular contraction
bivalve mollusks - clams, mussels, oysters and their relatives - provide an instructive contrast; in them, digestion is mostly intracellular, and cilia play a major role in moving food thru the digestive tract