Vasoconstriction

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Vasoconstriction is the decreasing of the diameter of the lumen of [[Blood vessels|blood vessels]] through the constriction of vascular [[Smooth muscle|smooth muscle]]<ref>Dee Unglaub Silverthorn (2010) Human Physiology An Integrated Approach, Sixth Edition, Glenview: Pearson. Page 469</ref>.  
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[[Vasoconstriction|Vasoconstriction ]]is the decreasing of the diameter of the [[Lumen|lumen]] of [[Blood vessels|blood vessels]] through the constriction of vascular [[Smooth muscle|smooth muscle]]<ref>Dee Unglaub Silverthorn (2010) Human Physiology An Integrated Approach, Sixth Edition, Glenview: Pearson. Page 469</ref>.  
  
 
It is a mechanism that can be used to help control [[Blood pressure|blood pressure]]. Vasoconstriction of [[Arterioles|arterioles]] reduces their diameter. This reduction in lumen diameter causes the resistance to [[Blood|blood]] flow to increase as more of the [[Red blood cells|Red Blood Cells]] come into contact with the arteriole walls. This causes blood pressure to increase<ref>Dee Unglaub Silverthorn (2010) Human Physiology An Integrated Approach, Sixth Edition, Glenview: Pearson. Page 519</ref>.  
 
It is a mechanism that can be used to help control [[Blood pressure|blood pressure]]. Vasoconstriction of [[Arterioles|arterioles]] reduces their diameter. This reduction in lumen diameter causes the resistance to [[Blood|blood]] flow to increase as more of the [[Red blood cells|Red Blood Cells]] come into contact with the arteriole walls. This causes blood pressure to increase<ref>Dee Unglaub Silverthorn (2010) Human Physiology An Integrated Approach, Sixth Edition, Glenview: Pearson. Page 519</ref>.  

Latest revision as of 14:28, 16 October 2017

Vasoconstriction is the decreasing of the diameter of the lumen of blood vessels through the constriction of vascular smooth muscle[1].

It is a mechanism that can be used to help control blood pressure. Vasoconstriction of arterioles reduces their diameter. This reduction in lumen diameter causes the resistance to blood flow to increase as more of the Red Blood Cells come into contact with the arteriole walls. This causes blood pressure to increase[2].

Vasoconstriction can be triggered by myogenic autoregulation or chemical mediators such as noradrenaline, serotonin, endothelin, vasopressin and angiotensin II[3].

References

  1. Dee Unglaub Silverthorn (2010) Human Physiology An Integrated Approach, Sixth Edition, Glenview: Pearson. Page 469
  2. Dee Unglaub Silverthorn (2010) Human Physiology An Integrated Approach, Sixth Edition, Glenview: Pearson. Page 519
  3. Dee Unglaub Silverthorn (2010) Human Physiology An Integrated Approach, Sixth Edition, Glenview: Pearson. Page 520
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