Concept explainers
To determine: The change in the shape of the tube due to the contraction of the circular muscle layer of the intestine.
Introduction: The gastrointestinal tract consists of a series of multiple hollow organs. Thes organs include the mouth, esophagus, stomach, small and large intestine. The lining of these organs is made up of unstriated muscles.
To determine: The change in the shape of the tube due to the contraction of the longitundinal muscle layer of the intestine.
Introduction: the The inner lining of the gastrointestinal tract is made up of smooth muscles. These are non striated and involuntary muscles. These muscles contract and relax to support the movement of substances inside the hollow organs.
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Human Physiology: An Integrated Approach (8th Edition)
- Why are there three layers of stomach muscle and how do they function?arrow_forwardWhich ring of muscle regulates the flow of chyme from the stomach to the small intestine?arrow_forwardWhat are the two main types of muscle movements in the Digestive tract? How are they different? What is an example of where each function?arrow_forward
- Which of the three types of muscle appears to have the most parallel fibers? Which of the three types of muscle has the most irregular fibers? Which of the muscle types appears to have the largest nuclei? Which of the types of muscle appears to consists of fibers that connect side to side like the off ramp of an interstate highways?arrow_forwardWhy is the orientation of muscle in the stomach wall important and how does it contribute to it’s function?arrow_forwardWhich of the following statements about smooth muscle is false? (a) Smooth muscle cells are called fibers. (b) Most smooth muscle cells, like cardiac muscle cells, are joined by gap junctions. (c) Smooth muscle cells have a single, centrally located nucleus. (d) Contraction of smooth muscle is stimulated exclusively by involuntary nerves. (e) Smooth muscle tissue found in the wall of hollow organs is arranged in sheets.arrow_forward
- How might reduced segmental contractions affect the digestive process?arrow_forwardWhere is smooth muscle found?arrow_forwardWhat types of muscle are involved in swallowing (indicated by boxed numerals), and what is the significance of the blue manometric traces in the diagram below? How is swallowing regulated? What is the difference between “dysphagia” and “achalasia,” and what structures are involved?arrow_forward
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