The submucous plexus and the myenteric plexus are components of the Blank ______.单项选择题

A

enteric nervous system

B

salivary glands

C

parasympathetic nervous system

D

serosa that connects the gut to the wall of the body cavity

E

lymphatic system of the gastrointestinal tract

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The gastrointestinal (GI) tract displays complex motor patterns when nutrients are present in the lumen; even when excised from an organism and completely isolated in physiological saline. This is demonstrated in an experiment with an isolated intestine similar to the image below. If the image doesn't show, it should not affect how you answer the question. Imagine a piece of isolate gut as you have seen in the lecture recordings. The following observations were made from this experiment:   An isolated intestine is capable of reflex contractile behavior.    Perfusing saline through the lumen of the isolated intestine produced no reflex motility.  Perfusing the lumen with nutrient content is able to evoke reflex contractions.  The observed contractile behavior is blocked by application of tetrodotoxin (TTX) to the organ bath. TTX blocks voltage-dependent sodium channels. Based on the observations above, which TWO of the following statements are CORRECT? SELECT ALL THE CORRECT OPTIONS. 1 mark will be awarded for each correct answer. Incorrect answers will results in deduction of -1 mark (you will not score lower than zero). Choose wisely. 

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Why might a common pharmaceutical treatment for depression cause dysregulation of the gastrointestinal tract?

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