• occur
  • Generalized vasoconstriction usually results in an increase in systemic blood pressure, but it may also occur in specific tissues, causing a localized reduction in blood flow. (wikipedia.org)
  • Although aquatic animals have evolved profound physiological adaptations to conserve oxygen during submersion, the apnea and breath-holding duration, bradycardia, vasoconstriction, and redistribution of cardiac output occur also in terrestrial animals as a neural response, but the effects are more profound in natural divers. (wikipedia.org)
  • mechanisms
  • These two compounds are transported to the smooth muscle and there react with cytochrome P450 to make 20-hydroxyeicosatetraenoic acid (20-HETE), which acts through yet to-be-determined mechanisms to induce vasoconstriction. (wikipedia.org)
  • responses
  • 20 - 26 Furthermore, inhibitory effects of 17β-estradiol on COX-dependent responses to vasoconstrictors have suggested a role of estrogen receptors, 27 although the specific estrogen receptor(s) involved in endothelium-dependent vasoconstriction have not been identified. (ahajournals.org)
  • Testosterone and nandrolone significantly reduced HDL-cholesterol levels, potentiated vasoconstriction responses to epinephrine, serotonin and endothelin-1, and attenuated vasorelaxant responses to sodium nitroprusside in rabbits. (biomedsearch.com)
  • decrease
  • Similar postangioplasty vasoconstriction was observed in the pig carotid arteries (decrease in minimal vessel cross-sectional area of 41% [angioplasty segment] versus 2% [control segment]) (p less than 0.005). (ahajournals.org)
  • oxygen
  • The most noticeable effects are on the cardiovascular system, which displays peripheral vasoconstriction, slowed pulse rate, redirection of blood to the vital organs to conserve oxygen, release of red blood cells stored in the spleen, and, in humans, heart rhythm irregularities. (wikipedia.org)
  • calcium
  • Additional experiments were carried out in rabbit aortas to determine the roles of the endothelium, extracellular calcium, indomethacin, ibuprofen, and calcium-channel blockade in modulating angioplasty-induced vasoconstriction. (ahajournals.org)
  • The vasoconstriction was only partially inhibited by calcium channel blockade with verapamil. (ahajournals.org)
  • shown
  • We have shown an attenuation of vasoconstriction during exercise with simultaneous stimulation of both populations of receptors. (lww.com)
  • weeks
  • Because other diseases (such as atherosclerosis) have similar angiographic presentations, it can only be conclusively diagnosed if vasoconstriction resolves within 12 weeks. (wikipedia.org)