Vasoactive intestinal polypeptide, 5-hydroxytryptamine and reflex hyperaemia in the small intestine of the cat.

1. The release of vasoactive intestinal polypeptide (VIP) into venous blood from the small intestine of the cat was studied when mechanically stimulating the intestinal mucosa and during close intra-arterial infusions of 5-hydroxytryptamine (5-HT) or isopropylnoradrenaline. The studies were performed on anaesthetized cats given atropine.2. Mechanical… (More)