The vasodilatation produced by carbon dioxide is maximum in:
Correct Answer: Brain
Description: Inhalation of 7% CO2 increases cerebral blood twofold. Cerebral blood vessels are very sensitive to CO2 tension. Hepatic aerial system is sensitive to adenosine; it brings about vasodilatation. Adenosine is the most impoant vasodilator of coronary vessels. CO2, H+, K+, hypoxia also cause reactive hyperemia. NO, an endothelium-derived relaxing factor is an impoant vasodilator of renal aerioles.
Category:
Physiology
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