10 Questions
What do the small mesenteric arteries form in the submucosa of the gastrointestinal tract?
Extensive vascular network
Which artery carries more than 10% of the cardiac output to supply the gastrointestinal tract?
Superior mesenteric artery
What is the purpose of the countercurrent exchange system in the villi of the gastrointestinal tract?
To enable diffusion of O2 from arterioles to venules
What happens when intestinal blood flow is very low?
Extensive necrosis of the intestinal villi takes place
What is the primary neural control of the mesenteric circulation?
Increased sympathetic activity through α1-adrenergic receptors
What effect does the agonist isoproterenol have on the mesenteric circulation?
Causes vasodilation
What is the principal mechanism responsible for autoregulation in the intestinal circulation?
Metabolic
What effect does adenosine have on the mesenteric vascular bed?
Causes vasodilation
What contributes to the hyperemia of the intestinal circulation during food ingestion?
Gastrin and cholecystokinin
Which products of digestion are potent vasodilators in the mesenteric circulation?
Glucose and fatty acids
Test your knowledge of the blood supply to the gastrointestinal tract and the vascular network within the submucosa. This quiz covers the celiac, superior mesenteric, and inferior mesenteric arteries, as well as the arterial branches and arterioles within the intestinal walls.
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