Arterial blood pressure traces from a sequence of procedures in the same animal during jejunal perfusions with 154 mmol L −1 choline chloride and EIPA: (A) Control recording without I.V. infusion with an absorption rate of −8.8 μ L cm −1 h −1 at a DBP of 118 mmHg. (B) Slow coinfusion of 50 μ g VIP I.V. and 3 μ g AVP I.V. with a secretion rate of +17.8 μ L cm −1 h −1 at a DBP of 112 mmHg. (C) Slow infusion of 50 μ g VIP I.V. with secretion rate of +26.0 μ L cm −1 h −1 at a DBP of 62 mmHg. D. Control recording without I.V. infusion with an absorption rate of −5.0 μ L cm −1 h −1 at a DBP of 104 mmHg. In B, the VIP infusion caused an initial dip in blood pressure which was restored to normal with the commencement of AVP infusion. In C, the marked fall in blood pressure marks the start of VIP infusion. The dashed horizontal line denotes 0 mmHg.
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