Why is the upper part of small intestine used (duodenum near stomach)? What are

Question

Why is the upper part of small intestine used (duodenum near stomach)? What are the effects and mechanisms of action of 25 degree C Tyrode's solution on the movements of gastrointestinal smooth muscle? What are the effects and mechanisms of action of ACh on the movements of gastrointestinal smooth muscle? What are the effects and mechanisms of action of NE on the movements of gastrointestinal smooth muscle? What are the effects and mechanisms of action of 1 mol/L HCl on the movements of gastrointestinal smooth muscle? What are the effects and mechanisms of action of 1 mol/L NaOH on the movements of gastrointestinal smooth muscle?

Explanation / Answer

1) The upper part of small intestine (duodenum) is used for studying the effect of temperature, acetyl choline, norepinephrine, HCl and NaOH on movements of small intestine because of the following properties of the muscles of duodenum which has

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