Which of these actions is necessary for blood vessels to dilate?
Inhibition of antibody production
Inhibition of the complement system
Secretion of histamines
Concentration of macrophages
Answer) c. Secretion s of histamines
We already know that Injured tissue that is mast cells release histamine. This histamine causes the surrounding blood vessels to dilate and raise in permeability. Similarly histamine also releases vascular smooth muscle cell relaxants, like for instanc nitric oxide, endothelium-derived hyperpolarizing factors and other compounds, and finally helps in blood vessel dilation. Therefore we can say that option c is the correct answer.
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