What's the difference between pressor and vasoconstrictive?
Pressor
Definition:
(a.) Causing, or giving rise to, pressure or to an increase of pressure; as, pressor nerve fibers, stimulation of which excites the vasomotor center, thus causing a stronger contraction of the arteries and consequently an increase of the arterial blood pressure; -- opposed to depressor.
Example Sentences:
(1) In telecost fishes, the corpuscles of Stannius contain Bowie-stainable granules and a renin-like pressor substance.
(2) Concerning the descending influences, it was found that stimulation of the anterior hypothalamus evokes depressor reactions, whereas stimulation of the posterior hypothalamus results in pressor reactions.
(3) The pressor effect induced by the kinin antagonist suggests that kinins may contribute to the regulation of blood pressure.
(4) Trimazosin at the dose used and under the conditions of study did not reverse the peripheral pressor effect of angiotensin II or B-HT920 but at higher concentrations, unlike prazosin, it relaxed the K+ contracted thoracic aorta.
(5) Lysine vasopressin was maximally antidiuretic in the absence of a significant pressor effect at a dose of 2.5 pmol h-1 100 g body weight-1.
(6) The possibility that the pressor effects of angiotensin II influence angiotensin-induced thirst was investigated in dogs pretreated with hexamethonium.
(7) Single shocks applied to medullary pressor sites evoked a train of spikes in the interneurons.
(8) Finally, fosinopril had no effect on the pressor or chronotropic effects of norepinephrine (NE) or 1,1-dimethyl-4-phenylpiperinium (DMPP) or electrical stimulation of the sympathetic ganglia of pithed rats.
(9) It was found that within the dorsal part of the well known pressor area there is a narrow strip, 2.5 mm lateral from the mid line, starting ventral to the inferior colliculus and ending in the medulla close to the floor of the IV ventricle, from which vasodilatation in skeletal muscles is selectively obtained.
(10) The present study, which fails to show augmented synthesis of PGs by renal tissues derived from gravid rats, is consistent with our previous investigation in which cyclooxygenase inhibition did not reduce the gestational increase of renal hemodynamics or restore the attenuated renal pressor responsiveness to exogenous angiotensin II.
(11) Diminished pressor responsiveness was considered to be due to concurrent reduction of central sympathetic vasomotor activity, because sympathetic nerve responses to hypothalamic stimulation were appreciably lessened in tripamide-treated SHR.
(12) Furthermore, this study demonstrates that the AV3V region is necessary for vasopressin-dependent pressor responses caused by an osmotic stimulus.
(13) However, the pressor response to the stressors was greater in ICI 118,551- than vehicle-treated F1, but the tachycardia was equivalent for both groups.
(14) The pacemaker remained responsive one year after implant, increasing rate during exercise, cold pressor stress, ischemia of the arms and emotional stress.
(15) To try to compare receptor compartment kinetics, receptor binding, and binding-response coupling for two smooth muscle types in vivo, pressor and uterine responses to oxypressin, an equipotent analog of oxytocin and vasopressin, were studied simultaneously in urethane-anesthetized, pentolinium-indomethacin treated rats.
(16) In contrast, in AP-lesioned dogs, AVPX alone substantially reduced the pressor response to BVB.
(17) Change of 5-hydroxytryptamine (5-HT) concentrations in platelets from patients with chronic tension-type headache (TH) and controls were observed during cold pressor test (CPT).
(18) However, unlike the HS response, the pressor effect to HG returned to base line within approximately 5 min during a 10-min infusion.
(19) In contrast, stimulus-induced pressor response of BP showed no consistent correlation to prestimulus BP.
(20) Microinjections of this agent into the VLPA prevented the pressor responses to subsequent microinjections of CD at the same sites, indicating that AFDX-116 blocked M2 receptors.